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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.

A369147 Number of unlabeled loop-graphs covering n vertices such that it is not possible to choose a different vertex from each edge (non-choosable).

Table of values

n a(n)
0 0
1 0
2 1
3 7
4 52
5 411
6 4440
7 73886
8 2128608
9 111533208
10 10812478194
11 1945437194308
12 650378721118910
13 404749938336301313
14 470163239887698682289
15 1022592854829028310302180
16 4177826139658552046624979658
17 32163829440870460348768017832607
18 468021728889827507080865185809438918

List of values

[0, 0, 1, 7, 52, 411, 4440, 73886, 2128608, 111533208, 10812478194, 1945437194308, 650378721118910, 404749938336301313, 470163239887698682289, 1022592854829028310302180, 4177826139658552046624979658, 32163829440870460348768017832607, 468021728889827507080865185809438918]

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

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