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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.

A351505 Expansion of e.g.f. 1/(1 + x^2/2 * log(1 - x)).

Table of values

n a(n)
0 1
1 0
2 0
3 3
4 6
5 20
6 270
7 1764
8 12600
9 146880
10 1597680
11 17934840
12 243777600
13 3506518080
14 52696595952
15 870564618000
16 15354480960000
17 284780747946240
18 5622461683666560
19 117425971162442880
20 2574172644658272000
21 59302473667128599040
22 1432738540209781728000

List of values

[1, 0, 0, 3, 6, 20, 270, 1764, 12600, 146880, 1597680, 17934840, 243777600, 3506518080, 52696595952, 870564618000, 15354480960000, 284780747946240, 5622461683666560, 117425971162442880, 2574172644658272000, 59302473667128599040, 1432738540209781728000]

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

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