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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.

A220831 Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [4], with each label used at least once.

Table of values

n a(n)
1 0
2 0
3 0
4 3
5 36
6 310
7 2376
8 17304
9 123508
10 874998
11 6197220
12 44035861
13 314538360
14 2260572810
15 16353884828
16 119102737971
17 873124996284
18 6441569967712
19 47813037934740
20 356947999429560
21 2679333805629928
22 20214890317096644
23 153250432833122904
24 1167042280999763748

List of values

[0, 0, 0, 3, 36, 310, 2376, 17304, 123508, 874998, 6197220, 44035861, 314538360, 2260572810, 16353884828, 119102737971, 873124996284, 6441569967712, 47813037934740, 356947999429560, 2679333805629928, 20214890317096644, 153250432833122904, 1167042280999763748]

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

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