cp's OEIS Frontend

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.

A317852 Number of plane trees with n nodes where the sequence of branches directly under any given node is aperiodic, meaning its cyclic permutations are all different.

Table of values

n a(n)
1 1
2 1
3 1
4 3
5 8
6 26
7 76
8 247
9 783
10 2565
11 8447
12 28256
13 95168
14 323720
15 1108415
16 3821144
17 13246307
18 46158480
19 161574043
20 567925140
21 2003653016
22 7092953340
23 25186731980
24 89690452750
25 320221033370
26 1146028762599
27 4110596336036
28 14774346783745
29 53203889807764
30 191934931634880

List of values

[1, 1, 1, 3, 8, 26, 76, 247, 783, 2565, 8447, 28256, 95168, 323720, 1108415, 3821144, 13246307, 46158480, 161574043, 567925140, 2003653016, 7092953340, 25186731980, 89690452750, 320221033370, 1146028762599, 4110596336036, 14774346783745, 53203889807764, 191934931634880]

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

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