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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.

A334580 Denominator of Sum_{k=1..n} (-1)^(k+1)/k^2.

Table of values

n a(n)
1 1
2 4
3 36
4 144
5 3600
6 1200
7 58800
8 235200
9 6350400
10 6350400
11 768398400
12 768398400
13 129859329600
14 129859329600
15 129859329600
16 519437318400
17 150117385017600
18 50039128339200
19 18064125330451200
20 3612825066090240
21 3612825066090240
22 3612825066090240
23 1911184459961736960

List of values

[1, 4, 36, 144, 3600, 1200, 58800, 235200, 6350400, 6350400, 768398400, 768398400, 129859329600, 129859329600, 129859329600, 519437318400, 150117385017600, 50039128339200, 18064125330451200, 3612825066090240, 3612825066090240, 3612825066090240, 1911184459961736960]

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

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