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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.

A220826 Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [2].

Table of values

n a(n)
1 2
2 3
3 4
4 6
5 12
6 31
7 78
8 234
9 722
10 2376
11 8046
12 28263
13 101226
14 370389
15 1375728
16 5182107
17 19743204
18 75994993
19 295110996
20 1155128397
21 4553360558
22 18063221619
23 72069527418
24 289053637621
25 1164871141254
26 4714973350560
27 19161577759814
28 78162897838290
29 319940064689142

List of values

[2, 3, 4, 6, 12, 31, 78, 234, 722, 2376, 8046, 28263, 101226, 370389, 1375728, 5182107, 19743204, 75994993, 295110996, 1155128397, 4553360558, 18063221619, 72069527418, 289053637621, 1164871141254, 4714973350560, 19161577759814, 78162897838290, 319940064689142]

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

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