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.

A319123 Number of series-reduced plane trees with n leaves such that each branch directly under any given node has a different number of leaves.

Table of values

n a(n)
1 1
2 1
3 3
4 7
5 21
6 75
7 277
8 1083
9 4419
10 18493
11 77729
12 332557
13 1444477
14 6307225
15 27912147
16 123878207
17 554733045
18 2492087531
19 11280537097
20 51120499279
21 233319480419
22 1065835004917
23 4895443823281
24 22505853359485
25 103958158302085
26 480365303903637
27 2229412587062123

List of values

[1, 1, 3, 7, 21, 75, 277, 1083, 4419, 18493, 77729, 332557, 1444477, 6307225, 27912147, 123878207, 554733045, 2492087531, 11280537097, 51120499279, 233319480419, 1065835004917, 4895443823281, 22505853359485, 103958158302085, 480365303903637, 2229412587062123]

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

Content is available under The OEIS End-User License Agreement.