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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.

A058338 Number of digraphs with indegree = outdegree at each vertex, or Eulerian digraphs (including disconnected graphs) with n nodes.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 18
5 111
6 2292
7 181519
8 51294836
9 48814342597
10 157166848652408
11 1736132851915020181
12 66689407510956897981608
13 9012860249531358132125181323
14 4328664025050045497712238253179872
15 7451990930474005836163802713084971814275
16 46329549163592383403451764167315165130121820112

List of values

[1, 1, 2, 5, 18, 111, 2292, 181519, 51294836, 48814342597, 157166848652408, 1736132851915020181, 66689407510956897981608, 9012860249531358132125181323, 4328664025050045497712238253179872, 7451990930474005836163802713084971814275, 46329549163592383403451764167315165130121820112]

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

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