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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.

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.

Table of values

n a(n)
0 1
1 1
2 4
3 16
4 93
5 652
6 6369
7 79568
8 1256425
9 24058631
10 543204998
11 14138916124
12 417362929209
13 13798729189578
14 505990335048034
15 20415765544541866
16 900364519682003919
17 43155049922002494115
18 2236988329443856718604
19 124862936181977439454012
20 7476052709321753156375756
21 478506183522725779096476581
22 32638841238874891261354722405
23 2365895836144423508306322639848
24 181785988254681334224483607437510
25 14771116583797935886529061991645404
26 1266545494725474774697216198539818982

List of values

[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]

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