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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.

A334585 Denominator of Sum_{k=1..n} (-1)^(k+1)/k^4.

Table of values

n a(n)
1 1
2 16
3 1296
4 20736
5 12960000
6 4320000
7 10372320000
8 165957120000
9 40327580160000
10 8065516032000
11 118087220224512000
12 118087220224512000
13 3372689096832287232000
14 3372689096832287232000
15 16863445484161436160000
16 269815127746582978560000
17 22535229284522356952309760000

List of values

[1, 16, 1296, 20736, 12960000, 4320000, 10372320000, 165957120000, 40327580160000, 8065516032000, 118087220224512000, 118087220224512000, 3372689096832287232000, 3372689096832287232000, 16863445484161436160000, 269815127746582978560000, 22535229284522356952309760000]

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

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