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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.

A215880 Expansion of e.g.f.: sqrt( -LambertW(x)*LambertW(-x)/x^2 ).

Table of values

n a(n)
0 1
1 0
2 2
3 0
4 76
5 0
6 9816
7 0
8 2731408
9 0
10 1327394080
11 0
12 998915378880
13 0
14 1076892609950080
15 0
16 1575062807865569536
17 0
18 3002359129582191616512
19 0
20 7232182908954405203184640
21 0
22 21483641086491531479896545280
23 0
24 77155816749532379835853517131776
25 0

List of values

[1, 0, 2, 0, 76, 0, 9816, 0, 2731408, 0, 1327394080, 0, 998915378880, 0, 1076892609950080, 0, 1575062807865569536, 0, 3002359129582191616512, 0, 7232182908954405203184640, 0, 21483641086491531479896545280, 0, 77155816749532379835853517131776, 0]

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

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