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.

A007863 Number of hybrid binary trees with n internal nodes.

Table of values

n a(n)
0 1
1 2
2 7
3 31
4 154
5 820
6 4575
7 26398
8 156233
9 943174
10 5785416
11 35955297
12 225914342
13 1432705496
14 9158708775
15 58954911423
16 381806076426
17 2485972170888
18 16263884777805
19 106858957537838
20 704810376478024
21 4664987368511948
22 30974829705533240
23 206266525653071416

List of values

[1, 2, 7, 31, 154, 820, 4575, 26398, 156233, 943174, 5785416, 35955297, 225914342, 1432705496, 9158708775, 58954911423, 381806076426, 2485972170888, 16263884777805, 106858957537838, 704810376478024, 4664987368511948, 30974829705533240, 206266525653071416]

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

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