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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.

A220817 Number of rooted binary MUL-trees with n leaves on the label set [4].

Table of values

n a(n)
1 4
2 10
3 40
4 215
5 1260
6 8010
7 53240
8 366680
9 2590420
10 18674660
11 136809240
12 1015603015
13 7622900360
14 57753364510
15 441081947840
16 3392237023425
17 26248421645200
18 204202630151860
19 1596256637347240
20 12531697773337965
21 98763817012822460
22 781102051887068160

List of values

[4, 10, 40, 215, 1260, 8010, 53240, 366680, 2590420, 18674660, 136809240, 1015603015, 7622900360, 57753364510, 441081947840, 3392237023425, 26248421645200, 204202630151860, 1596256637347240, 12531697773337965, 98763817012822460, 781102051887068160]

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

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