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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.

A293962 Number of linear chord diagrams having n chords and maximal chord length n, a(0)=1.

Table of values

n a(n)
0 1
1 1
2 2
3 10
4 70
5 630
6 6930
7 90090
8 1351350
9 22972950
10 436486050
11 9166207050
12 210822762150
13 5270569053750
14 142305364451250
15 4126855569086250
16 127932522641673750
17 4221773247175233750
18 147762063651133181250
19 5467196355091927706250
20 213220657848585180543750

List of values

[1, 1, 2, 10, 70, 630, 6930, 90090, 1351350, 22972950, 436486050, 9166207050, 210822762150, 5270569053750, 142305364451250, 4126855569086250, 127932522641673750, 4221773247175233750, 147762063651133181250, 5467196355091927706250, 213220657848585180543750]

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

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