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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.

A101388 Number of n-vertex unlabeled digraphs without endpoints.

Table of values

n a(n)
0 1
1 1
2 1
3 8
4 137
5 7704
6 1413982
7 855543836
8 1775124241697
9 12985137979651848
10 340909258684048264585
11 32512676857544231506934756
12 11365672344040389664750137465767
13 14668676509227095069116619104786898732
14 70315084528883620836175544247562749711989951

List of values

[1, 1, 1, 8, 137, 7704, 1413982, 855543836, 1775124241697, 12985137979651848, 340909258684048264585, 32512676857544231506934756, 11365672344040389664750137465767, 14668676509227095069116619104786898732, 70315084528883620836175544247562749711989951]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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