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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.

A054922 Number of connected unlabeled symmetric relations (graphs with loops) having n nodes such that complement is also connected.

Table of values

n a(n)
1 2
2 0
3 0
4 10
5 164
6 2670
7 56724
8 1867860
9 104538928
10 10461483366
11 1912179618740
12 644464839239880
13 402785011941549964
14 468944407349226545614
15 1021179521951204217530900
16 4174755063830188009750183026

List of values

[2, 0, 0, 10, 164, 2670, 56724, 1867860, 104538928, 10461483366, 1912179618740, 644464839239880, 402785011941549964, 468944407349226545614, 1021179521951204217530900, 4174755063830188009750183026]

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

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