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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.

A375806 Expansion of e.g.f. 1/(1 + (log(1 - x^2))/x)^2.

Table of values

n a(n)
0 1
1 2
2 6
3 30
4 192
5 1520
6 14220
7 153720
8 1881600
9 25728192
10 388402560
11 6415960320
12 115078138560
13 2227056923520
14 46247253212160
15 1025696098627200
16 24195406204569600
17 604862279807385600
18 15973029429800002560
19 444299711254300661760
20 12983645995613669376000

List of values

[1, 2, 6, 30, 192, 1520, 14220, 153720, 1881600, 25728192, 388402560, 6415960320, 115078138560, 2227056923520, 46247253212160, 1025696098627200, 24195406204569600, 604862279807385600, 15973029429800002560, 444299711254300661760, 12983645995613669376000]

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

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