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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.

A367500 The number of digraphs on n unlabeled nodes with each indegree >=1 and each outdegree >=1.

Table of values

n a(n)
0 1
1 0
2 1
3 5
4 90
5 5332
6 1076904
7 713634480
8 1586714659885
9 12154215627095823
10 328282817968663707661
11 31834558934274542784372501
12 11234635799120735533158176241587
13 14576389568173850099660541344975456791
14 70075904848498231395100110985113641934719377

List of values

[1, 0, 1, 5, 90, 5332, 1076904, 713634480, 1586714659885, 12154215627095823, 328282817968663707661, 31834558934274542784372501, 11234635799120735533158176241587, 14576389568173850099660541344975456791, 70075904848498231395100110985113641934719377]

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

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