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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.

A123549 Number of unlabeled connected bicolored graphs on 2n nodes which are invariant when the two color classes are interchanged.

Table of values

n a(n)
0 1
1 1
2 2
3 7
4 36
5 265
6 3039
7 56532
8 1795771
9 100752242
10 10189358360
11 1879720735880
12 637617233537026
13 400169631647375590
14 467115844246503901102
15 1018822456144128438039598
16 4169121243929999956903622399
17 32126195519194538601647462868271

List of values

[1, 1, 2, 7, 36, 265, 3039, 56532, 1795771, 100752242, 10189358360, 1879720735880, 637617233537026, 400169631647375590, 467115844246503901102, 1018822456144128438039598, 4169121243929999956903622399, 32126195519194538601647462868271]

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

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