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666,262,453B
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635M
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listlengths 1
128
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listlengths 1
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timestamp[us]date 1999-12-11 03:00:00
2025-04-28 00:58:08
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
A006201 | Number of colorings of labeled graphs on n nodes using exactly 3 colors, divided by 48. | [
"0",
"0",
"1",
"24",
"640",
"24000",
"1367296",
"122056704",
"17282252800",
"3897054412800",
"1400795928395776",
"802530102499344384",
"732523556206878392320",
"1064849635418836398243840",
"2464403435614136308036796416"
] | [
"nonn",
"easy",
"nice"
] | 31 | 1 | 4 | [
"A000683",
"A006201",
"A058843",
"A213442"
] | [
"M5167"
] | N. J. A. Sloane | 2018-12-01T04:47:49 | oeisdata/seq/A006/A006201.seq | a806990f9e43174caabcdd6bc8b84eb1 |
A006202 | Number of colorings of labeled graphs on n nodes using exactly 4 colors, divided by 4!*2^6. | [
"0",
"0",
"0",
"1",
"80",
"7040",
"878080",
"169967616",
"53247344640",
"27580935700480",
"23884321532149760",
"34771166607668412416",
"85316631064301031915520",
"353171748158258855521812480",
"2467057266045387831319241687040",
"29078599995993904385498084987109376"
] | [
"nonn",
"easy"
] | 26 | 1 | 5 | [
"A000683",
"A006202",
"A058875",
"A224068"
] | [
"M5356"
] | N. J. A. Sloane | 2019-09-05T04:09:56 | oeisdata/seq/A006/A006202.seq | 996b187ebdac77f738344ec1c0814e82 |
A006203 | Discriminants of imaginary quadratic fields with class number 3 (negated). | [
"23",
"31",
"59",
"83",
"107",
"139",
"211",
"283",
"307",
"331",
"379",
"499",
"547",
"643",
"883",
"907"
] | [
"fini",
"nonn",
"full",
"nice"
] | 46 | 1 | 1 | [
"A003173",
"A005847",
"A006203",
"A013658",
"A014602",
"A014603",
"A046002",
"A046020",
"A191410"
] | [
"M5131"
] | N. J. A. Sloane | 2025-02-16T08:32:29 | oeisdata/seq/A006/A006203.seq | f05eadf6a96511941c2285d0631f2230 |
A006204 | Number of starters in cyclic group of order 2n+1. | [
"1",
"1",
"3",
"9",
"25",
"133",
"631",
"3857",
"25905",
"188181",
"1515283",
"13376125",
"128102625",
"1317606101",
"14534145947",
"170922533545",
"2138089212789"
] | [
"nonn",
"nice",
"hard",
"more"
] | 39 | 1 | 3 | [
"A003111",
"A006204",
"A006717",
"A071607",
"A071608",
"A071706"
] | [
"M2802"
] | N. J. A. Sloane | 2024-08-05T13:52:36 | oeisdata/seq/A006/A006204.seq | 9cc50316751b228ee470051c9fe1ca3a |
A006205 | Number of inequivalent strong starters in cyclic group of order 2n+1. | [
"0",
"0",
"1",
"0",
"2",
"2",
"4",
"14",
"52",
"555",
"1257",
"7934",
"66757",
"336297",
"2558894",
"33642945",
"250637748",
"1653170339"
] | [
"nonn"
] | 24 | 1 | 5 | [
"A001443",
"A006205"
] | [
"M0341"
] | N. J. A. Sloane | 2024-08-05T13:53:05 | oeisdata/seq/A006/A006205.seq | 524cecbe0f74898c59d09dc18e05ec1b |
A006206 | Number of aperiodic binary necklaces of length n with no subsequence 00, excluding the necklace "0". | [
"1",
"1",
"1",
"1",
"2",
"2",
"4",
"5",
"8",
"11",
"18",
"25",
"40",
"58",
"90",
"135",
"210",
"316",
"492",
"750",
"1164",
"1791",
"2786",
"4305",
"6710",
"10420",
"16264",
"25350",
"39650",
"61967",
"97108",
"152145",
"238818",
"374955",
"589520",
"927200",
"1459960",
"2299854",
"3626200",
"5720274",
"9030450",
"14263078"
] | [
"nonn",
"easy",
"nice"
] | 117 | 1 | 5 | [
"A000045",
"A001461",
"A006206",
"A006207",
"A006208",
"A006209",
"A006210",
"A006211",
"A008683",
"A027750",
"A094392",
"A113788",
"A125951",
"A130628",
"A208092"
] | [
"M0317"
] | N. J. A. Sloane and Frank Ruskey | 2025-02-03T01:46:08 | oeisdata/seq/A006/A006206.seq | dcc5ca83d2d4e1d8b460db4aeaf75f68 |
A006207 | Generalized Fibonacci numbers A_{n,2}. | [
"1",
"1",
"0",
"1",
"1",
"2",
"2",
"3",
"4",
"6",
"8",
"11",
"16",
"23",
"32",
"46",
"66",
"94",
"136",
"195",
"282",
"408",
"592",
"856",
"1248",
"1814",
"2646",
"3858",
"5644",
"8246",
"12088",
"17706",
"25992",
"38155",
"56102",
"82490",
"121474",
"178902",
"263776",
"389033",
"574304",
"848069",
"1253344",
"1852926",
"2741164"
] | [
"nonn"
] | 33 | 1 | 6 | [
"A006206",
"A006207",
"A006208",
"A006209",
"A006210",
"A006211",
"A094392",
"A130628",
"A208092"
] | [
"M0286"
] | N. J. A. Sloane | 2018-11-18T07:39:07 | oeisdata/seq/A006/A006207.seq | 07a173549b96c916da1e3ecc5f5ca425 |
A006208 | Generalized Fibonacci numbers A_{n,3}. | [
"1",
"1",
"0",
"1",
"0",
"2",
"1",
"3",
"2",
"6",
"4",
"9",
"8",
"18",
"16",
"32",
"32",
"61",
"64",
"115",
"128",
"224",
"258",
"431",
"520",
"850",
"1050",
"1673",
"2128",
"3328",
"4320",
"6649",
"8788",
"13366",
"17920",
"26957",
"36610",
"54634",
"74932",
"111057",
"153656",
"226514",
"315616",
"463243",
"649334",
"949823",
"1337984",
"1951760"
] | [
"nonn"
] | 31 | 1 | 6 | [
"A006206",
"A006207",
"A006208",
"A006209",
"A006210",
"A006211",
"A094392",
"A130628",
"A208092"
] | [
"M0148"
] | N. J. A. Sloane | 2018-10-01T08:20:00 | oeisdata/seq/A006/A006208.seq | 64f48e9ef77fdbfb82422f10c51c3709 |
A006209 | Generalized Fibonacci numbers A_{n,4}. | [
"1",
"1",
"0",
"1",
"0",
"2",
"0",
"3",
"1",
"6",
"2",
"9",
"4",
"18",
"8",
"30",
"16",
"56",
"32",
"101",
"64",
"191",
"128",
"351",
"256",
"668",
"512",
"1257",
"1026",
"2402",
"2056",
"4592",
"4122",
"8854",
"8272",
"17092",
"16608",
"33212",
"33364",
"64674",
"67072",
"126490",
"134912",
"248038",
"271528",
"487986",
"546818",
"962350"
] | [
"nonn"
] | 30 | 1 | 6 | [
"A006206",
"A006207",
"A006208",
"A006209",
"A006210",
"A006211",
"A094392",
"A130628",
"A208092"
] | [
"M0027"
] | N. J. A. Sloane | 2025-01-05T19:51:33 | oeisdata/seq/A006/A006209.seq | 989dc43ef0f3da68b128702b1e1808a0 |
A006210 | Generalized Fibonacci numbers D_{n,2}. | [
"0",
"1",
"2",
"4",
"8",
"16",
"34",
"72",
"154",
"336",
"738",
"1632",
"3640",
"8160",
"18384",
"41616",
"94560",
"215600",
"493122",
"1130976",
"2600388",
"5992560",
"13838306",
"32016576",
"74203112",
"172252080",
"400451282",
"932247360",
"2173035800",
"5071299968",
"11848259458",
"27710346528",
"64871460996"
] | [
"nonn"
] | 17 | 1 | 3 | null | [
"M1132"
] | N. J. A. Sloane. | 2016-10-20T13:17:57 | oeisdata/seq/A006/A006210.seq | 80eaabd43a648652b612831fcd39d890 |
A006211 | Generalized Fibonacci numbers D_{n,3}. | [
"0",
"0",
"1",
"2",
"4",
"8",
"16",
"32",
"64",
"130",
"264",
"538",
"1104",
"2272",
"4692",
"9730",
"20236",
"42208",
"88288",
"185126",
"389072",
"819458",
"1729296",
"3655936",
"7742124",
"16420928",
"34879040",
"74185364",
"157986068",
"336845482",
"718988144",
"1536250336",
"3285674088",
"7033709954",
"15070204524"
] | [
"nonn"
] | 17 | 1 | 4 | null | [
"M1130"
] | N. J. A. Sloane. | 2016-10-20T13:18:11 | oeisdata/seq/A006/A006211.seq | fcf53757cddead0b270e9dfbc0111d05 |
A006212 | Number of down-up permutations of n+3 starting with n+1. | [
"0",
"1",
"4",
"14",
"56",
"256",
"1324",
"7664",
"49136",
"345856",
"2652244",
"22014464",
"196658216",
"1881389056",
"19192151164",
"207961585664",
"2385488163296",
"28879019769856",
"367966308562084",
"4922409168011264",
"68978503204900376",
"1010472388453728256",
"15445185289163949004"
] | [
"nonn",
"easy"
] | 40 | 0 | 3 | [
"A000111",
"A006212",
"A008282",
"A010094"
] | [
"M3485"
] | N. J. A. Sloane. | 2021-02-18T01:58:14 | oeisdata/seq/A006/A006212.seq | 701b79c9c9965009b9beb3cccf62840e |
A006213 | Number of down-up permutations of n+4 starting with n+1. | [
"0",
"2",
"10",
"46",
"224",
"1202",
"7120",
"46366",
"329984",
"2551202",
"21306880",
"191252686",
"1836652544",
"18793429202",
"204154071040",
"2346705139006",
"28459289083904",
"363156549211202",
"4864231397785600",
"68237760828425326",
"1000569392347480064",
"15306487540377673202"
] | [
"nonn",
"easy"
] | 39 | 0 | 2 | [
"A000111",
"A006213",
"A008282",
"A010094"
] | [
"M1970"
] | N. J. A. Sloane. | 2024-08-02T06:28:42 | oeisdata/seq/A006/A006213.seq | fa8edfe98757751b43d82618c59ca1af |
A006214 | Number of down-up permutations of n+5 starting with n+1. | [
"0",
"5",
"32",
"178",
"1024",
"6320",
"42272",
"306448",
"2401024",
"20253440",
"183194912",
"1769901568",
"18198049024",
"198465167360",
"2288729963552",
"27831596812288",
"355961301697024",
"4777174607790080",
"67129052143388192",
"985743987073220608",
"15098811288386497024",
"240833888369219993600"
] | [
"nonn",
"easy"
] | 31 | 0 | 2 | [
"A000111",
"A006214",
"A008282"
] | [
"M3967"
] | N. J. A. Sloane. | 2024-08-02T06:28:47 | oeisdata/seq/A006/A006214.seq | 4fca431c885585d77b75c4f86f6d1b85 |
A006215 | Number of down-up permutations of n+6 starting with n+1. | [
"0",
"16",
"122",
"800",
"5296",
"36976",
"275792",
"2204480",
"18870016",
"172585936",
"1681843712",
"17411416160",
"190939611136",
"2211961358896",
"26999750469632",
"346419349043840",
"4661658528710656",
"65657186909139856",
"966054350401175552",
"14822897275566895520"
] | [
"nonn",
"easy"
] | 27 | 0 | 2 | [
"A000111",
"A006215",
"A008282"
] | [
"M5007"
] | N. J. A. Sloane. | 2021-02-17T07:35:04 | oeisdata/seq/A006/A006215.seq | a25a636d8f8b0e8e9c73511640cc4fcf |
A006216 | Number of down-up permutations of n+4 starting with 4. | [
"2",
"5",
"14",
"46",
"178",
"800",
"4094",
"23536",
"150178",
"1053440",
"8057774",
"66750976",
"595380178",
"5688903680",
"57975175454",
"627692271616",
"7195247514178",
"87056789995520",
"1108708685037134",
"14825405274259456",
"207676251991176178"
] | [
"nonn",
"easy",
"nice"
] | 39 | 0 | 1 | [
"A000111",
"A006216",
"A008282"
] | [
"M1466"
] | N. J. A. Sloane | 2021-02-17T07:35:23 | oeisdata/seq/A006/A006216.seq | 4918890b977ac6eb50ff248a4ca05cf1 |
A006217 | Number of down-up permutations of n+5 starting with 5. | [
"5",
"16",
"56",
"224",
"1024",
"5296",
"30656",
"196544",
"1383424",
"10608976",
"88057856",
"786632864",
"7525556224",
"76768604656",
"831846342656",
"9541952653184",
"115516079079424",
"1471865234248336",
"19689636672045056",
"275914012819601504"
] | [
"nonn",
"easy"
] | 23 | 0 | 1 | [
"A000111",
"A006217",
"A008282"
] | [
"M3869"
] | N. J. A. Sloane. | 2021-02-17T19:28:08 | oeisdata/seq/A006/A006217.seq | 214f94ac31e4ffe89499a4e872199fbb |
A006218 | a(n) = Sum_{k=1..n} floor(n/k); also Sum_{k=1..n} d(k), where d = number of divisors (A000005); also number of solutions to x*y = z with 1 <= x,y,z <= n. | [
"0",
"1",
"3",
"5",
"8",
"10",
"14",
"16",
"20",
"23",
"27",
"29",
"35",
"37",
"41",
"45",
"50",
"52",
"58",
"60",
"66",
"70",
"74",
"76",
"84",
"87",
"91",
"95",
"101",
"103",
"111",
"113",
"119",
"123",
"127",
"131",
"140",
"142",
"146",
"150",
"158",
"160",
"168",
"170",
"176",
"182",
"186",
"188",
"198",
"201",
"207",
"211",
"217",
"219",
"227",
"231",
"239",
"243",
"247",
"249"
] | [
"nonn",
"easy",
"nice"
] | 278 | 0 | 3 | [
"A000005",
"A001659",
"A003988",
"A004125",
"A006218",
"A010766",
"A051731",
"A052511",
"A055507",
"A056535",
"A061017",
"A078567",
"A116477",
"A143236",
"A143724",
"A161700",
"A212120",
"A341062"
] | [
"M2432"
] | N. J. A. Sloane | 2024-08-02T04:32:24 | oeisdata/seq/A006/A006218.seq | 8cb96e683045f9bb39db8ed2e017a862 |
A006219 | From descending subsequences of permutations. | [
"3",
"8",
"25",
"89",
"357",
"1602",
"7959",
"43127",
"250591",
"1537051",
"9827077"
] | [
"nonn",
"more"
] | 10 | 3 | 1 | [
"A006219",
"A224652"
] | [
"M2752"
] | N. J. A. Sloane. | 2017-02-03T17:13:56 | oeisdata/seq/A006/A006219.seq | f8291219f14b7a718ecf5a4e9b4e03d2 |
A006220 | From descending subsequences of permutations. | [
"1",
"1",
"3",
"10",
"45",
"251",
"1638",
"12300",
"104877",
"1000135",
"10534062",
"121436206",
"1521332904"
] | [
"nonn",
"more"
] | 11 | 1 | 3 | [
"A006220",
"A224652"
] | [
"M2866"
] | N. J. A. Sloane. | 2017-02-03T17:12:20 | oeisdata/seq/A006/A006220.seq | e1d3ebaf6115e8e718da4e188ef07c64 |
A006221 | From Apery continued fraction for zeta(3): zeta(3)=6/(5-1^6/(117-2^6/(535-3^6/(1463...)))). | [
"5",
"117",
"535",
"1463",
"3105",
"5665",
"9347",
"14355",
"20893",
"29165",
"39375",
"51727",
"66425",
"83673",
"103675",
"126635",
"152757",
"182245",
"215303",
"252135",
"292945",
"337937",
"387315",
"441283",
"500045",
"563805",
"632767",
"707135",
"787113",
"872905",
"964715",
"1062747",
"1167205",
"1278293",
"1396215",
"1521175"
] | [
"nonn",
"easy"
] | 52 | 0 | 1 | [
"A002117",
"A005259",
"A006221"
] | [
"M4026"
] | N. J. A. Sloane | 2024-12-29T01:06:59 | oeisdata/seq/A006/A006221.seq | a205bf4f3236c7fe67d58a5b13d55408 |
A006222 | 11*n^2 + 11*n + 3. | [
"3",
"25",
"69",
"135",
"223",
"333",
"465",
"619",
"795",
"993",
"1213",
"1455",
"1719",
"2005",
"2313",
"2643",
"2995",
"3369",
"3765",
"4183",
"4623",
"5085",
"5569",
"6075",
"6603",
"7153",
"7725",
"8319",
"8935",
"9573",
"10233",
"10915",
"11619",
"12345",
"13093",
"13863",
"14655",
"15469",
"16305"
] | [
"nonn",
"easy"
] | 32 | 0 | 1 | null | [
"M3109"
] | N. J. A. Sloane. | 2022-09-08T08:44:34 | oeisdata/seq/A006/A006222.seq | 751d842214e74d15a265c4b044983a88 |
A006223 | Number of binary rooted trees of height n requiring 3 registers. | [
"1",
"14",
"118",
"780",
"4466",
"23276",
"113620",
"528840",
"2375100",
"10378056",
"44381832",
"186574864",
"773564328",
"3171317360",
"12880883408",
"51915526432",
"207893871472",
"827983736608"
] | [
"nonn"
] | 32 | 7 | 2 | null | [
"M4940"
] | N. J. A. Sloane | 2022-04-13T13:25:18 | oeisdata/seq/A006/A006223.seq | 4187af63d56db88b923bb1aa2bfb666d |
A006224 | Rabbytes: group eight successive Fibonacci numbers in binary and translate to decimal. | [
"0",
"1",
"3",
"14",
"59",
"477",
"7640",
"122253",
"3912117",
"116157794",
"3139131575",
"126930934745",
"6106040228240",
"155771414876393",
"7697370378785657",
"388117487932008034",
"10050682094475643867",
"513739377290126483005"
] | [
"nonn",
"base",
"easy"
] | 5 | 0 | 3 | [
"A006224",
"A006225"
] | null | Olivier Gérard | 2012-03-30T17:20:36 | oeisdata/seq/A006/A006224.seq | 50fa3d1d633fe756c3f9d0e619801941 |
A006225 | Rabbytes: group eight successive Fibonacci numbers in reversed binary and translate to decimal. | [
"0",
"1",
"3",
"13",
"55",
"445",
"7121",
"113947",
"3646325",
"99147089",
"2050446459",
"125018193357",
"5616378432777",
"30417995237783",
"6566814307004221",
"383349575034664217",
"5168339287595575151",
"549730084897741831651",
"22737447826678001578373"
] | [
"nonn",
"base",
"easy"
] | 5 | 0 | 3 | [
"A006224",
"A006225"
] | null | Olivier Gérard | 2012-03-30T17:20:36 | oeisdata/seq/A006/A006225.seq | 6aabb35a10ce79cc041274588c4206b6 |
A006226 | Number of abstract n-dimensional crystallographic point groups. | [
"1",
"2",
"9",
"18",
"118",
"239",
"1594"
] | [
"hard",
"nonn",
"more",
"nice"
] | 40 | 0 | 2 | [
"A004027",
"A004028",
"A004029",
"A006226"
] | [
"M1916"
] | N. J. A. Sloane | 2017-11-06T02:39:23 | oeisdata/seq/A006/A006226.seq | 7e7c1ff9ffa4739d81f4f13c4e83ab3e |
A006227 | Number of n-dimensional space groups (including enantiomorphs). | [
"1",
"2",
"17",
"230",
"4894",
"222097"
] | [
"nonn",
"hard",
"more",
"nice"
] | 78 | 0 | 2 | [
"A004027",
"A004029",
"A006227",
"A293061"
] | [
"M2104"
] | N. J. A. Sloane | 2023-10-04T16:17:23 | oeisdata/seq/A006/A006227.seq | f4894fd9aa6aca29888f2b3b40a2ebfa |
A006228 | Expansion of exp(arcsin(x)). | [
"1",
"1",
"1",
"2",
"5",
"20",
"85",
"520",
"3145",
"26000",
"204425",
"2132000",
"20646925",
"260104000",
"2993804125",
"44217680000",
"589779412625",
"9993195680000",
"151573309044625",
"2898026747200000",
"49261325439503125",
"1049085682486400000",
"19753791501240753125",
"463695871658988800000"
] | [
"nonn"
] | 44 | 0 | 4 | [
"A002019",
"A006228",
"A101927",
"A101928",
"A166741",
"A166748"
] | [
"M1523"
] | N. J. A. Sloane, Jeffrey Shallit | 2018-08-17T13:41:40 | oeisdata/seq/A006/A006228.seq | 42c8fc959ed5b3af341872095382a8d2 |
A006229 | Expansion of e.g.f. exp( tan x ). | [
"1",
"1",
"1",
"3",
"9",
"37",
"177",
"959",
"6097",
"41641",
"325249",
"2693691",
"24807321",
"241586893",
"2558036145",
"28607094455",
"342232522657",
"4315903789009",
"57569080467073",
"807258131578995",
"11879658510739497",
"183184249105857781",
"2948163649552594737",
"49548882107764546223"
] | [
"nonn",
"easy",
"nice"
] | 51 | 0 | 4 | [
"A000182",
"A003711",
"A003717",
"A006229",
"A047691",
"A047692",
"A059419",
"A111593"
] | [
"M2822"
] | N. J. A. Sloane, Jeffrey Shallit | 2024-12-29T03:52:47 | oeisdata/seq/A006/A006229.seq | d0362092683f576700a05635d00cfa65 |
A006230 | Bitriangular permutations. | [
"1",
"13",
"73",
"301",
"1081",
"3613",
"11593",
"36301",
"111961",
"342013",
"1038313",
"3139501",
"9467641",
"28501213",
"85700233",
"257493901",
"773268121",
"2321377213",
"6967277353",
"20908123501",
"62736953401",
"188236026013",
"564758409673",
"1694375892301",
"5083329003481",
"15250389663613"
] | [
"nonn",
"easy"
] | 39 | 4 | 2 | [
"A006230",
"A136301",
"A371761"
] | [
"M4902"
] | N. J. A. Sloane | 2024-04-12T14:00:06 | oeisdata/seq/A006/A006230.seq | d0f3c5c011fe107297a6ad592ca554d6 |
A006231 | a(n) = Sum_{k=2..n} n(n-1)...(n-k+1)/k. | [
"0",
"1",
"5",
"20",
"84",
"409",
"2365",
"16064",
"125664",
"1112073",
"10976173",
"119481284",
"1421542628",
"18348340113",
"255323504917",
"3809950976992",
"60683990530208",
"1027542662934897",
"18430998766219317",
"349096664728623316",
"6962409983976703316",
"145841989688186383337"
] | [
"nonn",
"easy",
"nice"
] | 92 | 1 | 3 | [
"A000295",
"A006231",
"A059760",
"A136394"
] | [
"M3908"
] | R. K. Guy | 2024-07-30T05:08:45 | oeisdata/seq/A006/A006231.seq | 03e2cd76a1d46455cd05edf977b5f649 |
A006232 | Numerators of Cauchy numbers of first type. | [
"1",
"1",
"-1",
"1",
"-19",
"9",
"-863",
"1375",
"-33953",
"57281",
"-3250433",
"1891755",
"-13695779093",
"24466579093",
"-132282840127",
"240208245823",
"-111956703448001",
"4573423873125",
"-30342376302478019",
"56310194579604163"
] | [
"sign",
"frac",
"nice"
] | 113 | 0 | 5 | [
"A002206",
"A002207",
"A002208",
"A002209",
"A002657",
"A002790",
"A006232",
"A006233"
] | [
"M5067"
] | N. J. A. Sloane | 2025-02-16T08:32:29 | oeisdata/seq/A006/A006232.seq | 2634916465e157299e5da01af0be38c4 |
A006233 | Denominators of Cauchy numbers of first type. | [
"1",
"2",
"6",
"4",
"30",
"4",
"84",
"24",
"90",
"20",
"132",
"8",
"5460",
"840",
"360",
"48",
"1530",
"4",
"1596",
"168",
"1980",
"1320",
"8280",
"80",
"81900",
"6552",
"1512",
"112",
"3480",
"80",
"114576",
"7392",
"117810",
"7140",
"1260",
"8",
"3838380",
"5928",
"936",
"48",
"81180",
"440",
"1191960",
"55440",
"869400",
"38640",
"236880",
"224"
] | [
"nonn",
"frac",
"nice",
"easy"
] | 87 | 0 | 2 | [
"A002206",
"A002207",
"A002208",
"A002209",
"A002657",
"A002790",
"A006232",
"A006233"
] | [
"M1558"
] | N. J. A. Sloane | 2025-02-16T08:32:29 | oeisdata/seq/A006/A006233.seq | 0525f726081dad554001a162c711449e |
A006234 | a(n) = n*3^(n-4). | [
"1",
"4",
"15",
"54",
"189",
"648",
"2187",
"7290",
"24057",
"78732",
"255879",
"826686",
"2657205",
"8503056",
"27103491",
"86093442",
"272629233",
"860934420",
"2711943423",
"8523250758",
"26732013741",
"83682825624",
"261508830075",
"815907549834",
"2541865828329"
] | [
"nonn",
"easy"
] | 101 | 3 | 2 | [
"A000244",
"A001792",
"A006234",
"A036290",
"A050914",
"A112626"
] | [
"M3496"
] | N. J. A. Sloane | 2025-02-16T08:32:29 | oeisdata/seq/A006/A006234.seq | 1c0560b4ea692ccf1be62afa3ff2eed8 |
A006235 | Complexity of doubled cycle (regarding case n = 2 as a multigraph). | [
"1",
"12",
"75",
"384",
"1805",
"8100",
"35287",
"150528",
"632025",
"2620860",
"10759331",
"43804800",
"177105253",
"711809364",
"2846259375",
"11330543616",
"44929049777",
"177540878700",
"699402223099",
"2747583822720",
"10766828545725",
"42095796462852",
"164244726238343",
"639620518118400",
"2486558615814025"
] | [
"nonn",
"easy"
] | 88 | 1 | 2 | [
"A001075",
"A006235",
"A006237",
"A072373",
"A129743",
"A173958"
] | [
"M4849"
] | N. J. A. Sloane | 2025-02-16T08:32:29 | oeisdata/seq/A006/A006235.seq | 30445bb6975b779b7d689fe53c219097 |
A006236 | a(n) = n^(n-2)*(n+2)^(n-1). | [
"1",
"4",
"75",
"3456",
"300125",
"42467328",
"8931928887",
"2621440000000",
"1025271882697689",
"515978035200000000",
"325063112540091870659",
"250738401558910243700736",
"232526248038920243408203125",
"255326682647558617373989666816",
"327696095670976278474202880859375",
"486146690661928563361690196851556352"
] | [
"nonn"
] | 18 | 1 | 2 | null | [
"M3698"
] | N. J. A. Sloane | 2024-05-19T08:05:06 | oeisdata/seq/A006/A006236.seq | f23784431acfbb586e4a28160b53c3c2 |
A006237 | Complexity of tensor sum of n graphs; or spanning trees on n-cube. | [
"1",
"1",
"4",
"384",
"42467328",
"20776019874734407680",
"1657509127047778993870601546036901052416000000",
"153850844349814660487100539994381178281567942393055761257560677644718869248475136000000000000000000000"
] | [
"nonn",
"easy",
"nice"
] | 47 | 0 | 3 | [
"A006235",
"A006237"
] | [
"M3725"
] | N. J. A. Sloane, Don Knuth | 2025-02-16T08:32:29 | oeisdata/seq/A006/A006237.seq | c85278efbf7b5ef4e1d087c232fbee2f |
A006238 | Complexity of (or spanning trees in) a 3 X n grid. | [
"1",
"15",
"192",
"2415",
"30305",
"380160",
"4768673",
"59817135",
"750331584",
"9411975375",
"118061508289",
"1480934568960",
"18576479568193",
"233018797965135",
"2922930580320960",
"36664523428884015",
"459910778352898337",
"5769007865476035840",
"72365017995700730081",
"907729015392142395375"
] | [
"nonn"
] | 62 | 1 | 2 | [
"A006238",
"A100047",
"A116469"
] | [
"M4986"
] | Frans J. Faase | 2024-05-19T09:42:44 | oeisdata/seq/A006/A006238.seq | 3d2c2127ff26cc061cfe3ad0e387a792 |
A006239 | Row 3 of array in A212801. | [
"1",
"13",
"108",
"793",
"5611",
"39312",
"274933",
"1923025",
"13455396",
"94169413",
"659134543",
"4613813568",
"32296413241",
"226074381637",
"1582520088348",
"11077641280225",
"77543496352291",
"542804506787088",
"3799631657379853",
"26597421924762793"
] | [
"nonn"
] | 32 | 1 | 2 | [
"A006239",
"A212801"
] | [
"M4909"
] | N. J. A. Sloane | 2025-02-16T08:32:29 | oeisdata/seq/A006/A006239.seq | 26fc4761482d6a8ffae9f6dbcf9b266a |
A006240 | Row 4 of array in A212801. | [
"1",
"40",
"793",
"12800",
"193721",
"2886520",
"42999713",
"642355200",
"9617422321",
"144167168200",
"2162192792233",
"32433400563200",
"486521516676521",
"7298047169453080",
"109472483776866353",
"1642098503032012800",
"24631532723767204321",
"369473147671033293160",
"5542096617629211606073",
"83131435057615545920000"
] | [
"nonn"
] | 32 | 1 | 2 | [
"A006240",
"A212801"
] | [
"M5271"
] | N. J. A. Sloane | 2025-02-16T08:32:29 | oeisdata/seq/A006/A006240.seq | b0adac4d8f17044b868edfc9d04427d8 |
A006241 | Number of minimal plane trees with n terminal nodes. | [
"1",
"1",
"1",
"2",
"1",
"3",
"1",
"6",
"2",
"3",
"1",
"20",
"1",
"3",
"3",
"54",
"1",
"34",
"1",
"44",
"3",
"3",
"1",
"764",
"2",
"3",
"10",
"140",
"1",
"283",
"1",
"4470",
"3",
"3",
"3",
"10416",
"1",
"3",
"3",
"10820",
"1",
"2227",
"1",
"2060",
"62",
"3",
"1",
"958476",
"2",
"250",
"3",
"8204",
"1",
"59154",
"3",
"316004",
"3",
"3",
"1",
"3457904",
"1",
"3",
"158",
"30229110",
"3"
] | [
"nonn"
] | 35 | 1 | 4 | [
"A001003",
"A006241",
"A281145"
] | [
"M0133"
] | N. J. A. Sloane | 2021-12-26T21:31:59 | oeisdata/seq/A006/A006241.seq | ad056c7ed1f9b9b3a0a810214c22f133 |
A006242 | Extracting a square root. | [
"10",
"970",
"912670090",
"760223786832147978143718730",
"439363892017598816969702791108195858981800447259539613873486126455827777484460810"
] | [
"nonn",
"easy"
] | 33 | 1 | 1 | [
"A006242",
"A006243"
] | [
"M4758"
] | N. J. A. Sloane | 2022-09-08T08:44:34 | oeisdata/seq/A006/A006242.seq | 132e7e7f6479d7f63d1324fa18a161d5 |
A006243 | Extracting a square root. | [
"198",
"7761798",
"467613464999866416198",
"102249460387306384473056172738577521087843948916391508591105798"
] | [
"nonn"
] | 31 | 1 | 1 | [
"A006242",
"A006243",
"A112845"
] | [
"M5412"
] | N. J. A. Sloane. | 2022-09-08T08:44:34 | oeisdata/seq/A006/A006243.seq | df41a5e86c859e5c061249d5c980e224 |
A006244 | Hexagonal numbers (A000384) which are also centered hexagonal numbers (A003215). | [
"1",
"91",
"8911",
"873181",
"85562821",
"8384283271",
"821574197731",
"80505887094361",
"7888755361049641",
"773017519495770451",
"75747828155224454551",
"7422514141692500775541",
"727330638057709851548461",
"71270980015513872950973631",
"6983828710882301839343867371",
"684343942686450066382748028721"
] | [
"nonn",
"easy"
] | 62 | 1 | 2 | [
"A000384",
"A001570",
"A001921",
"A003215",
"A006244",
"A253175"
] | [
"M5363"
] | N. J. A. Sloane, Jeffrey Shallit | 2025-02-16T08:32:29 | oeisdata/seq/A006/A006244.seq | a00dcbf6284336ea13357dac3a4f4a9e |
A006245 | Number of primitive sorting networks on n elements; also number of rhombic tilings of a 2n-gon. | [
"1",
"1",
"2",
"8",
"62",
"908",
"24698",
"1232944",
"112018190",
"18410581880",
"5449192389984",
"2894710651370536",
"2752596959306389652",
"4675651520558571537540",
"14163808995580022218786390",
"76413073725772593230461936736"
] | [
"nonn",
"nice",
"more"
] | 225 | 1 | 3 | [
"A005118",
"A006245",
"A006246",
"A006247",
"A060596",
"A060601"
] | [
"M1894"
] | N. J. A. Sloane | 2024-12-20T10:58:50 | oeisdata/seq/A006/A006245.seq | 728415f739dfa1acf7a0235b137afb9a |
A006246 | Number of simple arrangements of pseudolines in the projective plane with an oriented marked cell; number of oriented abstract order types of n points (distinguishing mirror-symmetric copies). | [
"1",
"1",
"1",
"2",
"3",
"20",
"242",
"6405",
"316835",
"28627261",
"4686329954",
"1382939012729",
"732955581630129"
] | [
"nonn",
"more"
] | 46 | 1 | 4 | [
"A006245",
"A006246",
"A006247"
] | [
"M0920"
] | N. J. A. Sloane | 2025-03-18T16:24:51 | oeisdata/seq/A006/A006246.seq | 378ee423a22243fdcf4aa7be62a07796 |
A006247 | Number of simple arrangements of n pseudolines in the projective plane with a marked cell. Number of Euclidean pseudo-order types: nondegenerate abstract order types of configurations of n points in the plane. | [
"1",
"1",
"1",
"2",
"3",
"16",
"135",
"3315",
"158830",
"14320182",
"2343203071",
"691470685682",
"366477801792538"
] | [
"nonn",
"nice",
"hard",
"more"
] | 118 | 1 | 4 | [
"A006245",
"A006247",
"A006248",
"A014540",
"A063666",
"A063852",
"A325595",
"A325628"
] | [
"M0917"
] | N. J. A. Sloane | 2023-12-22T14:25:22 | oeisdata/seq/A006/A006247.seq | 421bdbb23a937f416fb0d367b82d8ccc |
A006248 | Number of projective pseudo order types: simple arrangements of pseudo-lines in the projective plane. | [
"1",
"1",
"1",
"1",
"1",
"4",
"11",
"135",
"4382",
"312356",
"41848591",
"10320613331"
] | [
"nonn",
"nice",
"hard"
] | 94 | 1 | 6 | [
"A006245",
"A006246",
"A006248",
"A018242",
"A063666",
"A063851"
] | [
"M3428"
] | N. J. A. Sloane | 2023-11-15T06:00:40 | oeisdata/seq/A006/A006248.seq | c1a9314e906e968c12bb760cc7276a4c |
A006249 | Number of hypertournaments on n elements under preisomorphism. | [
"1",
"1",
"1",
"2",
"2",
"6",
"17",
"79"
] | [
"nonn"
] | 12 | 1 | 4 | null | [
"M0363"
] | N. J. A. Sloane. | 2012-03-30T16:44:56 | oeisdata/seq/A006/A006249.seq | 8ac6e1c692606cc51dfe1f34ea78415d |
A006250 | Number of hypertournaments on n elements under signed bijection. | [
"1",
"1",
"1",
"2",
"2",
"6",
"17",
"69"
] | [
"nonn"
] | 12 | 1 | 4 | null | [
"M0362"
] | N. J. A. Sloane. | 2012-03-30T16:44:56 | oeisdata/seq/A006/A006250.seq | 2bba6a41630040e0ee6347ccb10804b1 |
A006251 | Number of n-element posets which are unions of 2 chains. | [
"1",
"1",
"2",
"4",
"10",
"26",
"75",
"225",
"711",
"2311",
"7725",
"26313",
"91141",
"319749",
"1134234",
"4060128",
"14648614",
"53208998",
"194423568",
"714130372",
"2635256408",
"9764995800",
"36320086418",
"135548135854",
"507434502474",
"1904982684106",
"7170113287574",
"27051804890638",
"102287657120454",
"387558371409606",
"1471212825012499",
"5594771416613721"
] | [
"nonn",
"nice",
"easy"
] | 33 | 0 | 3 | null | [
"M1216"
] | N. J. A. Sloane | 2021-12-17T11:25:51 | oeisdata/seq/A006/A006251.seq | 34c5f1211ceebdf9d2dc1cdbeac06fc2 |
A006252 | Expansion of e.g.f. 1/(1 - log(1+x)). | [
"1",
"1",
"1",
"2",
"4",
"14",
"38",
"216",
"600",
"6240",
"9552",
"319296",
"-519312",
"28108560",
"-176474352",
"3998454144",
"-43985078784",
"837126163584",
"-12437000028288",
"237195036797184",
"-4235955315745536",
"85886259443020800",
"-1746536474655406080",
"38320721602434017280",
"-864056965711935974400"
] | [
"sign"
] | 72 | 0 | 4 | [
"A006252",
"A007840",
"A320080"
] | [
"M1275"
] | N. J. A. Sloane | 2022-05-22T09:50:00 | oeisdata/seq/A006/A006252.seq | b4591cc8cd682497753fcb908e3ab1c8 |
A006253 | Number of perfect matchings (or domino tilings) in C_4 X P_n. | [
"1",
"2",
"9",
"32",
"121",
"450",
"1681",
"6272",
"23409",
"87362",
"326041",
"1216800",
"4541161",
"16947842",
"63250209",
"236052992",
"880961761",
"3287794050",
"12270214441",
"45793063712",
"170902040409",
"637815097922",
"2380358351281",
"8883618307200",
"33154114877521",
"123732841202882"
] | [
"nonn",
"easy"
] | 122 | 0 | 2 | [
"A002530",
"A004003",
"A006125",
"A006253",
"A100047",
"A109437",
"A181206",
"A189650",
"A217233",
"A233308"
] | [
"M1926"
] | N. J. A. Sloane | 2024-07-19T19:30:37 | oeisdata/seq/A006/A006253.seq | 86ac676458f2fd6f4403cb7cd47990df |
A006254 | Numbers k such that 2k-1 is prime. | [
"2",
"3",
"4",
"6",
"7",
"9",
"10",
"12",
"15",
"16",
"19",
"21",
"22",
"24",
"27",
"30",
"31",
"34",
"36",
"37",
"40",
"42",
"45",
"49",
"51",
"52",
"54",
"55",
"57",
"64",
"66",
"69",
"70",
"75",
"76",
"79",
"82",
"84",
"87",
"90",
"91",
"96",
"97",
"99",
"100",
"106",
"112",
"114",
"115",
"117",
"120",
"121",
"126",
"129",
"132",
"135",
"136",
"139",
"141",
"142",
"147",
"154",
"156",
"157"
] | [
"nonn",
"easy"
] | 135 | 1 | 1 | [
"A000040",
"A005097",
"A006254",
"A065091",
"A067076",
"A086801",
"A089038",
"A089192",
"A089253",
"A089559",
"A097069",
"A097338",
"A097363",
"A097480",
"A097932",
"A098090",
"A098605",
"A101448",
"A105760",
"A130291",
"A153081",
"A153143",
"A155722",
"A173059"
] | null | Marc LeBrun | 2024-08-17T22:52:56 | oeisdata/seq/A006/A006254.seq | acc381c561f07d8b8c48646b41b09dfc |
A006255 | R. L. Graham's sequence: a(n) = smallest m for which there is a sequence n = b_1 < b_2 < ... < b_t = m such that b_1*b_2*...*b_t is a perfect square. | [
"1",
"6",
"8",
"4",
"10",
"12",
"14",
"15",
"9",
"18",
"22",
"20",
"26",
"21",
"24",
"16",
"34",
"27",
"38",
"30",
"28",
"33",
"46",
"32",
"25",
"39",
"35",
"40",
"58",
"42",
"62",
"45",
"44",
"51",
"48",
"36",
"74",
"57",
"52",
"50",
"82",
"56",
"86",
"55",
"60",
"69",
"94",
"54",
"49",
"63",
"68",
"65",
"106",
"70",
"66",
"72",
"76",
"87",
"118",
"75",
"122",
"93",
"77",
"64",
"78",
"80",
"134",
"85",
"92",
"84"
] | [
"nonn",
"nice"
] | 90 | 1 | 2 | [
"A006255",
"A066400",
"A066401",
"A067565",
"A070229",
"A072905",
"A092487",
"A233421",
"A245499"
] | [
"M4064"
] | N. J. A. Sloane, Robert G. Wilson v | 2024-10-08T06:26:30 | oeisdata/seq/A006/A006255.seq | 1857aa5d2debe5e062543a8f3b1e42e6 |
A006256 | a(n) = Sum_{k=0..n} binomial(3k,k)*binomial(3n-3k,n-k). | [
"1",
"6",
"39",
"258",
"1719",
"11496",
"77052",
"517194",
"3475071",
"23366598",
"157206519",
"1058119992",
"7124428836",
"47983020624",
"323240752272",
"2177956129818",
"14677216121871",
"98923498131762",
"666819212874501",
"4495342330033938",
"30308036621747679",
"204356509814519712"
] | [
"nonn",
"easy",
"nice"
] | 106 | 0 | 2 | [
"A005809",
"A006256",
"A036829"
] | [
"M4229"
] | N. J. A. Sloane, Don Knuth | 2022-09-08T08:44:34 | oeisdata/seq/A006/A006256.seq | abef985ccd239e293408474b779d104e |
A006257 | Josephus problem: a(2*n) = 2*a(n)-1, a(2*n+1) = 2*a(n)+1. | [
"0",
"1",
"1",
"3",
"1",
"3",
"5",
"7",
"1",
"3",
"5",
"7",
"9",
"11",
"13",
"15",
"1",
"3",
"5",
"7",
"9",
"11",
"13",
"15",
"17",
"19",
"21",
"23",
"25",
"27",
"29",
"31",
"1",
"3",
"5",
"7",
"9",
"11",
"13",
"15",
"17",
"19",
"21",
"23",
"25",
"27",
"29",
"31",
"33",
"35",
"37",
"39",
"41",
"43",
"45",
"47",
"49",
"51",
"53",
"55",
"57",
"59",
"61",
"63",
"1",
"3",
"5",
"7",
"9",
"11",
"13",
"15",
"17",
"19",
"21",
"23",
"25",
"27",
"29"
] | [
"nonn",
"easy",
"nice"
] | 226 | 0 | 4 | [
"A005428",
"A006257",
"A032434",
"A035327",
"A038572",
"A049940",
"A049964",
"A053644",
"A053645",
"A054995",
"A088147",
"A088442",
"A181281",
"A360099"
] | [
"M2216"
] | N. J. A. Sloane | 2025-02-16T08:32:29 | oeisdata/seq/A006/A006257.seq | 81ce9b5d075286d02c047821dee2ab7c |
A006258 | Numerators of approximations to e. | [
"1",
"2",
"3",
"5",
"8",
"11",
"19",
"30",
"49",
"68",
"87",
"106",
"193",
"299",
"492",
"685",
"878",
"1071",
"1264",
"1457",
"2721",
"4178",
"6899",
"9620",
"12341",
"15062",
"17783",
"20504",
"23225",
"25946",
"49171",
"75117",
"124288",
"173459",
"222630",
"271801",
"320972",
"370143",
"419314",
"468485",
"517656",
"566827",
"1084483",
"1651310",
"2735793"
] | [
"nonn",
"easy"
] | 16 | 1 | 2 | [
"A001113",
"A006258",
"A006259",
"A119014"
] | [
"M0686"
] | N. J. A. Sloane. | 2021-11-15T02:47:05 | oeisdata/seq/A006/A006258.seq | 09ce5b638a4e07a135f2269dda4f1298 |
A006259 | Denominators of approximations to e. | [
"1",
"1",
"1",
"2",
"3",
"4",
"7",
"11",
"18",
"25",
"32",
"39",
"71",
"110",
"181",
"252",
"323",
"394",
"465",
"536",
"1001",
"1537",
"2538",
"3539",
"4540",
"5541",
"6542",
"7543",
"8544",
"9545",
"18089",
"27634",
"45723",
"63812",
"81901",
"99990",
"118079",
"136168",
"154257",
"172346",
"190435",
"208524",
"398959",
"607483"
] | [
"nonn",
"frac"
] | 18 | 1 | 4 | [
"A001113",
"A006258",
"A006259",
"A119015"
] | [
"M0584"
] | N. J. A. Sloane. | 2021-11-15T02:47:26 | oeisdata/seq/A006/A006259.seq | 41ccb20920dc5fb4ae776e8af248f3c7 |
A006260 | Second-order Eulerian numbers <<n,3>>. | [
"0",
"24",
"444",
"4400",
"32120",
"195800",
"1062500",
"5326160",
"25243904",
"114876376",
"507259276",
"2189829808",
"9292526920",
"38917528600",
"161343812980",
"663661077072",
"2713224461136",
"11039636532120",
"44751359547420",
"180880752056880"
] | [
"nonn",
"easy"
] | 28 | 3 | 2 | [
"A006260",
"A008517",
"A163936",
"A201637"
] | [
"M5162"
] | N. J. A. Sloane, Mira Bernstein, Robert G. Wilson v | 2018-08-11T02:56:13 | oeisdata/seq/A006/A006260.seq | 9d3c7a3efad13fd0a4c851ec29f8af11 |
A006261 | a(n) = Sum_{k=0..5} binomial(n,k). | [
"1",
"2",
"4",
"8",
"16",
"32",
"63",
"120",
"219",
"382",
"638",
"1024",
"1586",
"2380",
"3473",
"4944",
"6885",
"9402",
"12616",
"16664",
"21700",
"27896",
"35443",
"44552",
"55455",
"68406",
"83682",
"101584",
"122438",
"146596",
"174437",
"206368",
"242825",
"284274",
"331212",
"384168",
"443704",
"510416",
"584935",
"667928",
"760099",
"862190"
] | [
"nonn",
"easy"
] | 107 | 0 | 2 | [
"A000124",
"A000125",
"A000127",
"A002522",
"A005408",
"A006261",
"A007318",
"A008859",
"A008860",
"A008861",
"A008862",
"A008863",
"A016813",
"A057703",
"A058331",
"A080856",
"A086514",
"A161701",
"A161702",
"A161703",
"A161704",
"A161706",
"A161707",
"A161708",
"A161710",
"A161711",
"A161712",
"A161713",
"A161715",
"A219531"
] | [
"M1126"
] | N. J. A. Sloane, based on a suggestion from S. C. Chan, Jun 10 1975 | 2024-05-20T10:30:26 | oeisdata/seq/A006/A006261.seq | d6cf16fea979e7e4d5e6230ebe4d9d1c |
A006262 | Product k^(2^(k-2)), k = 2..n. | [
"1",
"2",
"18",
"4608",
"1800000000",
"5077997833420800000000",
"5608281336980602120684110607059901336780800000000"
] | [
"nonn",
"easy"
] | 11 | 1 | 2 | null | [
"M2111"
] | N. J. A. Sloane. | 2012-03-30T16:44:56 | oeisdata/seq/A006/A006262.seq | 52feec1649466533e67e160ad25958c2 |
A006263 | Erroneous version of A014221. | [
"1",
"2",
"4",
"65536"
] | [
"dead"
] | 16 | 0 | 2 | null | [
"M1310"
] | null | 2015-02-26T04:42:40 | oeisdata/seq/A006/A006263.seq | 7b89ab1e519efc97a76394aa6f2c6792 |
A006264 | Diagonal length function. | [
"0",
"0",
"1",
"1",
"4",
"4",
"4",
"4",
"5",
"5",
"5",
"5",
"5",
"5",
"5",
"5",
"8",
"8",
"8",
"8",
"8",
"8",
"8",
"8",
"8",
"8",
"8",
"8",
"8",
"8",
"8",
"8",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"9",
"10",
"10",
"10",
"10",
"10",
"10",
"10",
"10",
"10",
"10"
] | [
"nonn"
] | 7 | 0 | 5 | null | [
"M3223"
] | N. J. A. Sloane. | 2012-03-30T16:44:56 | oeisdata/seq/A006/A006264.seq | 94cd2729486a0ec8009ed4c64b67908b |
A006265 | Number of shapes of height-balanced AVL trees with n nodes. | [
"1",
"1",
"2",
"1",
"4",
"6",
"4",
"17",
"32",
"44",
"60",
"70",
"184",
"476",
"872",
"1553",
"2720",
"4288",
"6312",
"9004",
"16088",
"36900",
"82984",
"174374",
"346048",
"653096",
"1199384",
"2160732",
"3812464",
"6617304",
"11307920",
"18978577",
"31327104",
"51931296",
"90400704",
"170054336",
"341729616",
"711634072",
"1491256624"
] | [
"nonn"
] | 55 | 1 | 3 | [
"A006265",
"A036662",
"A134306",
"A143897",
"A217298"
] | [
"M0170"
] | N. J. A. Sloane | 2019-06-11T04:45:07 | oeisdata/seq/A006/A006265.seq | 8d268ed8d5b86f074a90c63a6b494303 |
A006266 | A continued cotangent. | [
"2",
"14",
"2786",
"21624372014",
"10111847525912679844192131854786",
"1033930953043290626825587838528711318150300040875029341893199068078185510802565166824630504014"
] | [
"nonn",
"easy"
] | 32 | 0 | 1 | [
"A002203",
"A006266",
"A006267",
"A114525",
"A145451",
"A145452",
"A271222",
"A271224"
] | [
"M2073"
] | N. J. A. Sloane | 2022-11-29T09:42:23 | oeisdata/seq/A006/A006266.seq | 8c5b6a54c7504034b03e356cfa32b088 |
A006267 | Continued cotangent for the golden ratio. | [
"1",
"4",
"76",
"439204",
"84722519070079276",
"608130213374088941214747405817720942127490792974404"
] | [
"nonn",
"easy"
] | 79 | 0 | 2 | [
"A000032",
"A000204",
"A001622",
"A001999",
"A002666",
"A002667",
"A002668",
"A002813",
"A006266",
"A006267",
"A045529",
"A268924",
"A271223"
] | [
"M3699"
] | N. J. A. Sloane | 2025-02-16T08:32:30 | oeisdata/seq/A006/A006267.seq | e9cad1de1b8aee268d845532cd777b2b |
A006268 | A continued cotangent. | [
"3",
"36",
"46764",
"102266868132036",
"1069559300034650646049671039050649693658764"
] | [
"nonn",
"easy"
] | 22 | 0 | 1 | [
"A002813",
"A006266",
"A006267",
"A006268",
"A006269",
"A006273",
"A145180",
"A145181",
"A145182",
"A145183",
"A145184",
"A145185",
"A145186",
"A145187",
"A145188",
"A145189"
] | [
"M3141"
] | N. J. A. Sloane. | 2022-01-20T10:29:44 | oeisdata/seq/A006/A006268.seq | bbb6b2164caa71647d610dd1ea26e37a |
A006269 | A continued cotangent. | [
"5",
"140",
"2744420",
"20670535451567121260",
"8831921094058107711185956797335984862612406515067837739780"
] | [
"nonn"
] | 16 | 0 | 1 | null | [
"M4028"
] | N. J. A. Sloane. | 2020-08-28T06:15:18 | oeisdata/seq/A006/A006269.seq | f25e50dfa8c4099454065710a945d9a1 |
A006270 | Denominators of a continued fraction for (1 + sqrt(5))/2. | [
"1",
"3",
"72",
"439128",
"84722519069640072",
"608130213374088941214747405817720857404971722895128"
] | [
"nonn"
] | 11 | 0 | 2 | [
"A002814",
"A006270"
] | [
"M3170"
] | N. J. A. Sloane. | 2013-04-28T17:56:56 | oeisdata/seq/A006/A006270.seq | d23568ef944e83855e0902fff0002aee |
A006271 | Numerators of a continued fraction for 1 + sqrt(2). | [
"2",
"5",
"197",
"7761797",
"467613464999866416197",
"102249460387306384473056172738577521087843948916391508591105797"
] | [
"nonn",
"easy"
] | 28 | 0 | 1 | [
"A002814",
"A006266",
"A006271",
"A006272",
"A006273",
"A006275",
"A006276"
] | [
"M1555"
] | N. J. A. Sloane. | 2022-01-20T10:18:18 | oeisdata/seq/A006/A006271.seq | 5291ca1ebf07a291734b960d5bf6931e |
A006272 | Denominators of a continued fraction for 1 + sqrt(2). | [
"12",
"2772",
"21624369228",
"10111847525912679844170507482772"
] | [
"nonn"
] | 12 | 0 | 1 | [
"A006271",
"A006272"
] | [
"M4883"
] | N. J. A. Sloane. | 2013-04-28T17:57:23 | oeisdata/seq/A006/A006272.seq | 2184aa5badfbb01f4e6f22299de4d22b |
A006273 | Numerators of a continued fraction for (3+sqrt(13))/2. | [
"3",
"10",
"1297",
"2186871697",
"10458512317535240383929505297"
] | [
"nonn",
"frac"
] | 23 | 0 | 1 | [
"A002814",
"A006268",
"A006271",
"A006273",
"A006274",
"A006275",
"A006276",
"A098316"
] | [
"M2879"
] | N. J. A. Sloane. | 2022-01-20T10:18:27 | oeisdata/seq/A006/A006273.seq | 40b92cc59f53538eea58eb570a6d3d4a |
A006274 | First differences of A006268. | [
"33",
"46728",
"102266868085272",
"1069559300034650646049671038948382825526728"
] | [
"nonn",
"frac"
] | 18 | 0 | 1 | [
"A006268",
"A006273",
"A006274",
"A098316"
] | [
"M5243"
] | N. J. A. Sloane. | 2023-05-23T18:44:14 | oeisdata/seq/A006/A006274.seq | faca728ffea28320ccd0a647a6ce160d |
A006275 | Pierce expansion of sqrt(2) - 1. | [
"2",
"5",
"7",
"197",
"199",
"7761797",
"7761799",
"467613464999866416197",
"467613464999866416199",
"102249460387306384473056172738577521087843948916391508591105797"
] | [
"nonn",
"easy"
] | 57 | 0 | 1 | [
"A006275",
"A006276",
"A014176"
] | [
"M1342"
] | N. J. A. Sloane | 2025-02-16T08:32:30 | oeisdata/seq/A006/A006275.seq | 92b01b7a66ccc0c8a9495ce65dd1d737 |
A006276 | Pierce expansion of (3 - sqrt(5))/2. | [
"2",
"4",
"17",
"19",
"5777",
"5779",
"192900153617",
"192900153619",
"7177905237579946589743592924684177",
"7177905237579946589743592924684179",
"369822356418414944143680173221426891716916679027557977938929258031490127514207143830378340325399155217"
] | [
"nonn",
"easy"
] | 46 | 0 | 1 | [
"A006276",
"A118242"
] | [
"M1298"
] | N. J. A. Sloane | 2025-02-16T08:32:30 | oeisdata/seq/A006/A006276.seq | e2ee7d123dc27a5097e1fe163dfc660d |
A006277 | a(n) = (a(n-1) + 1)*a(n-2). | [
"1",
"1",
"2",
"3",
"8",
"27",
"224",
"6075",
"1361024",
"8268226875",
"11253255215681024",
"93044467205527772332546875",
"1047053135870867396062743192203958743681024",
"97422501162981936223682742789520433197690551802305989766350860546875"
] | [
"nonn"
] | 58 | 0 | 3 | [
"A001622",
"A006277",
"A242724",
"A243967",
"A243968"
] | [
"M0888"
] | N. J. A. Sloane, Jeffrey Shallit | 2024-12-15T20:38:18 | oeisdata/seq/A006/A006277.seq | 8b59af404cdd3ce853cc7b267a7760b9 |
A006278 | a(n) is the product of the first n primes congruent to 1 (mod 4). | [
"5",
"65",
"1105",
"32045",
"1185665",
"48612265",
"2576450045",
"157163452745",
"11472932050385",
"1021090952484265",
"99045822390973705",
"10003628061488344205",
"1090395458702229518345",
"123214686833351935572985"
] | [
"nonn"
] | 50 | 1 | 1 | [
"A002110",
"A002144",
"A006278",
"A038346",
"A078586",
"A185952"
] | null | GeneSalamin(AT)cohr.com | 2025-02-16T08:32:30 | oeisdata/seq/A006/A006278.seq | d904d2a467c37a97fe3ae66ce3e53ca0 |
A006279 | Denominators of convergents to Cahen's constant: a(n+2) = a(n)^2*a(n+1) + a(n). | [
"1",
"1",
"2",
"3",
"14",
"129",
"25298",
"420984147",
"269425140741515486",
"47749585090209528873482531562977121",
"3466137915373323052799848584927709551269254572949111609037058632767202"
] | [
"nonn",
"easy",
"frac"
] | 41 | 0 | 3 | [
"A006279",
"A006280",
"A006281",
"A118227"
] | [
"M0914"
] | N. J. A. Sloane. | 2024-03-19T11:58:32 | oeisdata/seq/A006/A006279.seq | 1c09098c67ddf98f0722d8558f4d5495 |
A006280 | Partial quotients in continued fraction expansion of Cahen's constant. | [
"0",
"1",
"1",
"1",
"4",
"9",
"196",
"16641",
"639988804",
"177227652025317609",
"72589906463585427805281295977816196",
"2280022876287160141646375873338796324543839666085098409289740769448641"
] | [
"nonn",
"easy"
] | 35 | 0 | 5 | [
"A006279",
"A006280",
"A006281",
"A118227"
] | [
"M3372"
] | N. J. A. Sloane. | 2025-02-21T13:07:19 | oeisdata/seq/A006/A006280.seq | c51f889c95c117db9308b5959a40d561 |
A006281 | Partial quotients in continued fraction expansion of 2C-1, where C is Cahen's constant. | [
"0",
"3",
"2",
"18",
"98",
"33282",
"319994402",
"354455304050635218",
"36294953231792713902640647988908098"
] | [
"nonn",
"easy"
] | 22 | 0 | 2 | [
"A006279",
"A006280",
"A006281",
"A118227"
] | [
"M2260"
] | N. J. A. Sloane. | 2024-03-19T03:20:09 | oeisdata/seq/A006/A006281.seq | 6aaa8a228e730b8d83e7afd89fd8d8d2 |
A006282 | Sorting numbers: number of comparisons in Batcher's parallel sort. | [
"0",
"1",
"3",
"5",
"9",
"12",
"16",
"19",
"26",
"31",
"37",
"41",
"48",
"53",
"59",
"63",
"74",
"82",
"91",
"97",
"107",
"114",
"122",
"127",
"138",
"146",
"155",
"161",
"171",
"178",
"186",
"191",
"207",
"219",
"232",
"241",
"255",
"265",
"276",
"283",
"298",
"309",
"321",
"329",
"342",
"351",
"361",
"367",
"383",
"395",
"408",
"417",
"431",
"441",
"452",
"459",
"474"
] | [
"nonn",
"easy",
"nice",
"changed"
] | 34 | 1 | 3 | [
"A003075",
"A006282",
"A083742"
] | [
"M2447"
] | N. J. A. Sloane | 2025-04-16T03:02:19 | oeisdata/seq/A006/A006282.seq | 3aa72e1f23b5c4c70a05311e742d0678 |
A006283 | Pierce expansion for 1 / Pi. | [
"3",
"22",
"118",
"383",
"571",
"635",
"70529",
"375687",
"399380",
"575584",
"699357",
"1561065",
"1795712",
"194445473",
"253745996",
"3199003690",
"3727084011",
"6607433185",
"16248462801",
"172940584814",
"313728984965",
"796022309187",
"5348508258636",
"5962546521072",
"97497255361780",
"121347007731845"
] | [
"nonn"
] | 44 | 0 | 1 | [
"A006283",
"A154956"
] | [
"M3092"
] | Jeffrey Shallit | 2025-02-16T08:32:30 | oeisdata/seq/A006/A006283.seq | 93013e5c65c7c2f7934eb6171ba12e4e |
A006284 | Pierce expansion for Euler's constant. | [
"1",
"2",
"6",
"13",
"21",
"24",
"225",
"615",
"17450",
"23228",
"57774",
"221361",
"522377",
"793040",
"1706305",
"8664354",
"19037086",
"51965160",
"56870701",
"124645388",
"784244500",
"792809072",
"3675221276",
"42108268014",
"53633289500",
"56827261536",
"67080647365"
] | [
"nonn"
] | 32 | 0 | 2 | [
"A006275",
"A006276",
"A006283",
"A006284"
] | [
"M1593"
] | N. J. A. Sloane, Jeffrey Shallit | 2025-02-16T08:32:30 | oeisdata/seq/A006/A006284.seq | e1bc28a00e7b71782e29196d0923a878 |
A006285 | Odd numbers not of form p + 2^k (de Polignac numbers). | [
"1",
"127",
"149",
"251",
"331",
"337",
"373",
"509",
"599",
"701",
"757",
"809",
"877",
"905",
"907",
"959",
"977",
"997",
"1019",
"1087",
"1199",
"1207",
"1211",
"1243",
"1259",
"1271",
"1477",
"1529",
"1541",
"1549",
"1589",
"1597",
"1619",
"1649",
"1657",
"1719",
"1759",
"1777",
"1783",
"1807",
"1829",
"1859",
"1867",
"1927",
"1969",
"1973",
"1985",
"2171",
"2203",
"2213",
"2231",
"2263",
"2279",
"2293",
"2377",
"2429",
"2465",
"2503",
"2579",
"2669"
] | [
"nonn",
"nice",
"easy"
] | 138 | 1 | 2 | [
"A006285",
"A058517",
"A065381",
"A098237",
"A109925",
"A118954",
"A133122",
"A156695",
"A232460",
"A254248",
"A276417",
"A350957",
"A350959",
"A350960"
] | [
"M5390"
] | N. J. A. Sloane | 2024-10-14T02:55:27 | oeisdata/seq/A006/A006285.seq | 074671a9f3249f314630de176e892816 |
A006286 | Numbers not of form p + 2^x + 2^y. | [
"1",
"2",
"3",
"128",
"150",
"252",
"332",
"338",
"374",
"510",
"600",
"702",
"758",
"810",
"878",
"906",
"908",
"960",
"978",
"998",
"1020",
"1088",
"1200",
"1208",
"1212",
"1244",
"1260",
"1272",
"1478",
"1530",
"1542",
"1550",
"1590",
"1598",
"1620",
"1650",
"1658",
"1720",
"1760",
"1778",
"1784",
"1808",
"1830",
"1860",
"1868"
] | [
"nonn"
] | 30 | 1 | 2 | [
"A006285",
"A006286",
"A156695"
] | [
"M0925"
] | N. J. A. Sloane. | 2024-07-28T00:08:46 | oeisdata/seq/A006/A006286.seq | a0c2352f099ab9df43ade987729e8a4a |
A006287 | Sum of squares of digits of ternary representation of n. | [
"0",
"1",
"4",
"1",
"2",
"5",
"4",
"5",
"8",
"1",
"2",
"5",
"2",
"3",
"6",
"5",
"6",
"9",
"4",
"5",
"8",
"5",
"6",
"9",
"8",
"9",
"12",
"1",
"2",
"5",
"2",
"3",
"6",
"5",
"6",
"9",
"2",
"3",
"6",
"3",
"4",
"7",
"6",
"7",
"10",
"5",
"6",
"9",
"6",
"7",
"10",
"9",
"10",
"13",
"4",
"5",
"8",
"5",
"6",
"9",
"8",
"9",
"12",
"5",
"6",
"9",
"6",
"7"
] | [
"nonn",
"base"
] | 23 | 0 | 3 | [
"A006287",
"A053735"
] | [
"M3194"
] | N. J. A. Sloane. | 2017-07-09T10:14:31 | oeisdata/seq/A006/A006287.seq | 3b9d68c150c9a264a8bf0ae3e672039b |
A006288 | Loxton-van der Poorten sequence: base-4 representation contains only -1, 0, +1. | [
"0",
"1",
"3",
"4",
"5",
"11",
"12",
"13",
"15",
"16",
"17",
"19",
"20",
"21",
"43",
"44",
"45",
"47",
"48",
"49",
"51",
"52",
"53",
"59",
"60",
"61",
"63",
"64",
"65",
"67",
"68",
"69",
"75",
"76",
"77",
"79",
"80",
"81",
"83",
"84",
"85",
"171",
"172",
"173",
"175",
"176",
"177",
"179",
"180",
"181",
"187",
"188",
"189",
"191",
"192",
"193",
"195",
"196",
"197",
"203",
"204",
"205",
"207",
"208",
"209"
] | [
"nonn"
] | 34 | 0 | 3 | [
"A006288",
"A023713",
"A023717",
"A344892",
"A344893"
] | [
"M2312"
] | N. J. A. Sloane | 2021-06-08T02:29:58 | oeisdata/seq/A006/A006288.seq | 50c112fe043ea37c5ac34f2d38892c7f |
A006289 | Number of series-reduced 2-connected graphs with n nodes. | [
"1",
"3",
"19",
"149",
"2581",
"84151",
"5201856",
"577050233",
"113372069299",
"39618015318982",
"24916462761069296",
"28563626972509456884",
"60366734349116636660402",
"237406975840304068884168139",
"1750330441810569047176394509086"
] | [
"nonn",
"nice"
] | 24 | 4 | 2 | [
"A006289",
"A006290",
"A339068",
"A339069"
] | [
"M3058"
] | N. J. A. Sloane | 2020-11-25T08:01:25 | oeisdata/seq/A006/A006289.seq | 3478f9cc50d7236a767bc73fc1305b33 |
A006290 | Number of 3-connected graphs with n nodes. | [
"1",
"3",
"17",
"136",
"2388",
"80890",
"5114079",
"573273505",
"113095167034",
"39582550575765",
"24908445793058442",
"28560405143495819079",
"60364410130177223014724",
"237403933018799958309530349",
"1750323137355778190158082029500",
"24333358813699371350715221107464003",
"640811613278752754485012443963579501421"
] | [
"nonn",
"nice"
] | 46 | 4 | 2 | [
"A000088",
"A001349",
"A002218",
"A006289",
"A006290",
"A007112",
"A338511",
"A339072"
] | [
"M3039"
] | N. J. A. Sloane | 2025-02-16T08:32:30 | oeisdata/seq/A006/A006290.seq | bfa25eacb73a978b69b9e8248ed0f8bb |
A006291 | Pseudo-bricks with n nodes. | [
"1",
"7",
"88",
"1731",
"55094",
"2806539"
] | [
"nonn",
"more"
] | 14 | 4 | 2 | [
"A006291",
"A006292",
"A006293"
] | [
"M4450"
] | N. J. A. Sloane. | 2018-12-02T04:08:02 | oeisdata/seq/A006/A006291.seq | 7c54f42e766911c70d43eafbcb8b901e |
A006292 | Pseudo-bricks with n nodes. | [
"1",
"3",
"24",
"159",
"2044",
"36181"
] | [
"nonn",
"more"
] | 14 | 4 | 2 | [
"A006291",
"A006292",
"A006293"
] | [
"M3105"
] | N. J. A. Sloane. | 2018-12-02T04:08:07 | oeisdata/seq/A006/A006292.seq | 2d25915ea3284658331fc488bf78462c |
A006293 | Pseudo-bricks with n nodes. | [
"1",
"5",
"56",
"945",
"28569",
"1421360"
] | [
"nonn",
"more"
] | 14 | 4 | 2 | [
"A006291",
"A006292",
"A006293"
] | [
"M4015"
] | N. J. A. Sloane. | 2018-12-02T04:08:11 | oeisdata/seq/A006/A006293.seq | 52d82def04905d0fb344769434c487b6 |
A006294 | Number of rooted planar maps with n edges. | [
"1",
"1",
"5",
"22",
"164",
"1030",
"8885",
"65954",
"614404",
"5030004",
"49145460",
"429166584",
"4331674512",
"39599553708",
"409230997461",
"3871362876810",
"40730958917220",
"395684757649324",
"4222043580320852",
"41894315105061848",
"452123832420881296"
] | [
"nonn"
] | 24 | 0 | 3 | [
"A006294",
"A269920"
] | [
"M3922"
] | N. J. A. Sloane. | 2021-05-09T08:19:48 | oeisdata/seq/A006/A006294.seq | 9d121a3eb09ce770efd70ceec67a4f73 |
A006295 | Number of genus 1 rooted maps with 2 faces with n vertices. | [
"10",
"167",
"1720",
"14065",
"100156",
"649950",
"3944928",
"22764165",
"126264820",
"678405090",
"3550829360",
"18182708362",
"91392185080",
"452077562620",
"2205359390592",
"10627956019245",
"50668344988068",
"239250231713210",
"1120028580999440",
"5202779260636958",
"23998704563581000",
"109991785264412452"
] | [
"nonn"
] | 37 | 3 | 1 | [
"A002802",
"A006295",
"A006296",
"A269921",
"A270406",
"A287046",
"A287047",
"A287048",
"A288071",
"A288072",
"A288073",
"A288074"
] | [
"M4739"
] | N. J. A. Sloane | 2025-01-18T09:08:05 | oeisdata/seq/A006/A006295.seq | 1f4e296c5c9e5cab8ec70bc09e3abede |
A006296 | Number of genus 1 rooted maps with 3 faces with n vertices. | [
"70",
"1720",
"24164",
"256116",
"2278660",
"17970784",
"129726760",
"875029804",
"5593305476",
"34225196720",
"201976335288",
"1156128848680",
"6447533938280",
"35155923872640",
"187959014565840",
"987658610225052",
"5110652802256260",
"26084524995672080",
"131501187454625560",
"655590388845975000",
"3235463376771463288",
"15820770680078552000",
"76708503479715247920",
"369046200766330733880",
"1762793459781859039080",
"8364468224596427692896",
"39445646133672676352560",
"184956513528952419546448",
"862615498961026097997392",
"4003067488703222112053760",
"18489846573354278755829152",
"85028133934182275077421180",
"389398354121840111751946628",
"1776360539933013004774353872",
"8073622060225813990245976280",
"36567311475673299914222851832"
] | [
"nonn"
] | 30 | 4 | 1 | [
"A002802",
"A006295",
"A006296",
"A269921",
"A270407",
"A287046",
"A287047",
"A287048",
"A288071",
"A288072",
"A288073",
"A288074"
] | [
"M5341"
] | N. J. A. Sloane. | 2017-12-14T21:20:54 | oeisdata/seq/A006/A006296.seq | 17048f319a9ae8eb597c2cc52bcaef76 |
A006297 | Number of rooted genus-1 maps with n edges. | [
"1",
"10",
"167",
"1720",
"24164",
"256116",
"3392843",
"36703824",
"472592916",
"5188948072",
"65723863196",
"729734918432",
"9145847808784",
"102432266545800",
"1274461449989715",
"14373136466094880",
"177882700353757460",
"2017523504473479992",
"24868664942648145372"
] | [
"nonn"
] | 20 | 2 | 2 | [
"A006297",
"A269921"
] | [
"M4740"
] | N. J. A. Sloane. | 2017-12-14T21:20:43 | oeisdata/seq/A006/A006297.seq | cf44f8d8d086b9c63111403f0df2f61d |
A006298 | Number of genus 2 rooted maps with 1 face with n vertices. | [
"21",
"483",
"6468",
"66066",
"570570",
"4390386",
"31039008",
"205633428",
"1293938646",
"7808250450",
"45510945480",
"257611421340",
"1422156202740",
"7683009544980",
"40729207226400",
"212347275857640",
"1090848505817070",
"5530195966465170",
"27704671055301240",
"137308238124957900",
"673903972248687180"
] | [
"nonn",
"easy"
] | 75 | 4 | 1 | [
"A000108",
"A002802",
"A006298",
"A035309"
] | [
"M5117"
] | N. J. A. Sloane | 2024-03-08T15:37:44 | oeisdata/seq/A006/A006298.seq | c049f34260b731518850427e6b4ca00d |
A006299 | Number of rooted genus-2 maps with n edges. | [
"21",
"483",
"15018",
"258972",
"5554188",
"85421118",
"1558792200",
"22555934280",
"375708427812",
"5235847653036",
"82234427131416",
"1117259292848016",
"16842445235560944",
"224686278407291148",
"3286157560248860532",
"43241609165618454096",
"617910462111714896820"
] | [
"nonn"
] | 16 | 4 | 1 | [
"A006299",
"A269922"
] | [
"M5118"
] | N. J. A. Sloane. | 2017-02-27T13:01:33 | oeisdata/seq/A006/A006299.seq | 4fc9c73cf9a0f70dc45d38e598d0c84e |
A006300 | Number of rooted maps with n edges on torus. | [
"1",
"20",
"307",
"4280",
"56914",
"736568",
"9370183",
"117822512",
"1469283166",
"18210135416",
"224636864830",
"2760899996816",
"33833099832484",
"413610917006000",
"5046403030066927",
"61468359153954656",
"747672504476150374",
"9083423595292949240",
"110239596847544663002",
"1336700736225591436496",
"16195256987701502444284"
] | [
"nonn",
"nice"
] | 55 | 2 | 2 | [
"A000168",
"A006300",
"A006301",
"A006386",
"A007137",
"A104742",
"A215402",
"A238355",
"A238356",
"A238357",
"A238358",
"A238359",
"A238360",
"A238396"
] | [
"M5097"
] | N. J. A. Sloane | 2024-08-23T03:16:29 | oeisdata/seq/A006/A006300.seq | 0e1543cb06fa426b385e45d6adadcb4d |
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