This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A050913 #13 Jul 01 2025 19:25:51 %S A050913 1,1,4,16,93,652,6369,79568,1256425,24058631,543204998,14138916124, %T A050913 417362929209,13798729189578,505990335048034,20415765544541866, %U A050913 900364519682003919,43155049922002494115,2236988329443856718604,124862936181977439454012,7476052709321753156375756,478506183522725779096476581,32638841238874891261354722405,2365895836144423508306322639848,181785988254681334224483607437510,14771116583797935886529061991645404,1266545494725474774697216198539818982 %N 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. %H A050913 Vladeta Jovovic, <a href="/A050535/a050535.pdf">Number of m-rowed binary matrices with all row sums equal to n, up to row and column permutation</a> %Y A050913 Row n=3 of A331461. %Y A050913 Cf. A050911, A050912, A001400, A014395, A082789, A082790, A058790. %K A050913 nonn %O A050913 0,3 %A A050913 _Vladeta Jovovic_, Dec 29 1999 %E A050913 More terms from T. Forbes (anthony.d.forbes(AT)googlemail.com), May 24 2003