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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.

A220827 Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [3].

Table of values

n a(n)
1 3
2 6
3 10
4 21
5 63
6 227
7 891
8 3876
9 17790
10 85536
11 424926
12 2169376
13 11312838
14 60065901
15 323746095
16 1767667332
17 9760149468
18 54422364834
19 306101712771
20 1735044593418
21 9902940693084
22 56876247586827
23 328516343529525
24 1907316302027081
25 11125942281844011
26 65182572852807465

List of values

[3, 6, 10, 21, 63, 227, 891, 3876, 17790, 85536, 424926, 2169376, 11312838, 60065901, 323746095, 1767667332, 9760149468, 54422364834, 306101712771, 1735044593418, 9902940693084, 56876247586827, 328516343529525, 1907316302027081, 11125942281844011, 65182572852807465]

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

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