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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.

A253649 Coefficients in the expansion of sn(t * x, m) / t in powers of x where t = sqrt( -1/2 - sqrt(1/3)), m = -7 + sqrt(48), and sn() is a Jacobi elliptic function.

Table of values

n a(n)
0 1
1 1
2 0
3 -10
4 -80
5 0
6 17600
7 418000
8 0
9 -496672000
10 -23576960000
11 0
12 91442700800000
13 7255463564800000
14 0
15 -69994087116448000000
16 -8354181454767104000000
17 0
18 169165728883243642880000000
19 28336045031124313753600000000
20 0
21 -1072156342430107319243161600000000

List of values

[1, 1, 0, -10, -80, 0, 17600, 418000, 0, -496672000, -23576960000, 0, 91442700800000, 7255463564800000, 0, -69994087116448000000, -8354181454767104000000, 0, 169165728883243642880000000, 28336045031124313753600000000, 0, -1072156342430107319243161600000000]

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

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