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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.

A370166 Number of unlabeled loop-graphs covering n vertices without a non-loop edge with loops at both ends.

Table of values

n a(n)
0 1
1 1
2 3
3 9
4 36
5 180
6 1313
7 14709
8 277755
9 9304977
10 568315345
11 63806703305
12 13200565313255
13 5042653259803433
14 3567050969262370941
15 4688444463558713135201
16 11491940559865490367844649
17 52719458629883487816297211441
18 454220675869975957947658748125099

List of values

[1, 1, 3, 9, 36, 180, 1313, 14709, 277755, 9304977, 568315345, 63806703305, 13200565313255, 5042653259803433, 3567050969262370941, 4688444463558713135201, 11491940559865490367844649, 52719458629883487816297211441, 454220675869975957947658748125099]

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

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