A050913 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.

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

Offset: 0

Author

Vladeta Jovovic, Dec 29 1999

Keywords

• nonn

Links

• Vladeta Jovovic, Number of m-rowed binary matrices with all row sums equal to n, up to row and column permutation

Crossrefs

Row n=3 of A331461.

Cf. A050911, A050912, A001400, A014395, A082789, A082790, A058790.

Extensions

More terms from T. Forbes (anthony.d.forbes(AT)googlemail.com), May 24 2003