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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.

A320270 Number of unlabeled balanced semi-binary rooted trees with n nodes.

Table of values

n a(n)
1 1
2 1
3 2
4 2
5 3
6 4
7 6
8 7
9 10
10 13
11 19
12 25
13 35
14 46
15 65
16 88
17 124
18 171
19 242
20 334
21 470
22 653
23 921
24 1287
25 1822
26 2565
27 3640
28 5144
29 7311
30 10360
31 14734
32 20918
33 29781
34 42361
35 60389
36 86069
37 122893
38 175479
39 250922
40 358863

List of values

[1, 1, 2, 2, 3, 4, 6, 7, 10, 13, 19, 25, 35, 46, 65, 88, 124, 171, 242, 334, 470, 653, 921, 1287, 1822, 2565, 3640, 5144, 7311, 10360, 14734, 20918, 29781, 42361, 60389, 86069, 122893, 175479, 250922, 358863]

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

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