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A050913
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Pure 2-complexes on an infinite set of nodes with n multiple 2-simplexes. Also n-rowed binary matrices with all row sums 3, up to row and column permutation.
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13
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1, 1, 4, 16, 93, 652, 6369, 79568, 1256425, 24058631, 543204998, 14138916124, 417362929209, 13798729189578, 505990335048034, 20415765544541866, 900364519682003919, 43155049922002494115, 2236988329443856718604, 124862936181977439454012, 7476052709321753156375756, 478506183522725779096476581, 32638841238874891261354722405, 2365895836144423508306322639848, 181785988254681334224483607437510, 14771116583797935886529061991645404, 1266545494725474774697216198539818982
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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LINKS
| Vladeta Jovovic, Number of m-rowed binary matrices with all row sums equal to n, up to row and column permutation
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CROSSREFS
| Cf. A050911, A050912, A001400, A014395, A082789, A082790, A058790.
Sequence in context: A003762 A143501 A111291 * A096243 A131928 A098580
Adjacent sequences: A050910 A050911 A050912 * A050914 A050915 A050916
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KEYWORD
| nonn
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Dec 29 1999
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EXTENSIONS
| More terms from T. Forbes (anthony.d.forbes(AT)googlemail.com), May 24, 2003
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