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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.

A319155 Number of bicolored graphs on 2n unlabeled nodes without isolated nodes and which are invariant when the two color classes are interchanged.

Table of values

n a(n)
0 1
1 1
2 3
3 11
4 51
5 337
6 3500
7 60936
8 1866002
9 102768062
10 10296340496
11 1890236147880
12 639528747831552
13 400813006079742544
14 467517947968588109568
15 1019290779610824185400096
16 4170141472168738281510957264
17 32130367702064742239376997422512

List of values

[1, 1, 3, 11, 51, 337, 3500, 60936, 1866002, 102768062, 10296340496, 1890236147880, 639528747831552, 400813006079742544, 467517947968588109568, 1019290779610824185400096, 4170141472168738281510957264, 32130367702064742239376997422512]

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

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