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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.

A121357 Number of different, not necessarily connected, labeled trivalent diagrams of size n.

Table of values

n a(n)
0 1
1 1
2 2
3 12
4 90
5 546
6 6156
7 81432
8 942012
9 15114780
10 294765336
11 5069224656
12 108842183352
13 2770895886552
14 64609245619920
15 1742542175582496
16 55074355772360976
17 1626315165597840912
18 53331321825434963232

List of values

[1, 1, 2, 12, 90, 546, 6156, 81432, 942012, 15114780, 294765336, 5069224656, 108842183352, 2770895886552, 64609245619920, 1742542175582496, 55074355772360976, 1626315165597840912, 53331321825434963232]

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

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