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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.

A052510 Number of labeled planar binary trees with 2n-1 elements (external nodes or internal nodes).

Table of values

n a(n)
1 1
2 6
3 240
4 25200
5 5080320
6 1676505600
7 821966745600
8 560992303872000
9 508633022177280000
10 591438478187741184000
11 858123464716031754240000
12 1519736656012092236759040000
13 3226517823533365056503808000000
14 8089341114715793820234547200000000

List of values

[1, 6, 240, 25200, 5080320, 1676505600, 821966745600, 560992303872000, 508633022177280000, 591438478187741184000, 858123464716031754240000, 1519736656012092236759040000, 3226517823533365056503808000000, 8089341114715793820234547200000000]

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

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