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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.

A007140 Number of unlabeled bicolored graphs, with no isolated nodes, on 2n nodes having n nodes of each color and allowing the color classes to be interchanged.

Table of values

n a(n)
0 1
1 1
2 3
3 14
4 115
5 2086
6 101791
7 14835870
8 6852422567
9 10338780759514
10 51804974736769271
11 872530598196790164797
12 49930445153769776449253479
13 9805619466642079028742952893709
14 6670375074613812276139335045628924297
15 15853216549413764390038207575938343994222273

List of values

[1, 1, 3, 14, 115, 2086, 101791, 14835870, 6852422567, 10338780759514, 51804974736769271, 872530598196790164797, 49930445153769776449253479, 9805619466642079028742952893709, 6670375074613812276139335045628924297, 15853216549413764390038207575938343994222273]

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

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