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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.

A370875 Expansion of e.g.f. (1/x) * Series_Reversion( x/(x + exp(x^2)) ).

Table of values

n a(n)
0 1
1 1
2 4
3 24
4 228
5 2820
6 44400
7 840000
8 18669840
9 475871760
10 13698296640
11 439402803840
12 15545690233920
13 601352177025600
14 25251437978807040
15 1143932660001331200
16 55612090342967558400
17 2887929114414030086400
18 159548423949650274739200

List of values

[1, 1, 4, 24, 228, 2820, 44400, 840000, 18669840, 475871760, 13698296640, 439402803840, 15545690233920, 601352177025600, 25251437978807040, 1143932660001331200, 55612090342967558400, 2887929114414030086400, 159548423949650274739200]

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

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