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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.

A336242 a(n) = (n!)^2 * Sum_{d|n} (-1)^(d+1) / (d!)^2.

Table of values

n a(n)
1 1
2 3
3 37
4 431
5 14401
6 403199
7 25401601
8 1216454399
9 135339724801
10 9877056537599
11 1593350922240001
12 178056522962841599
13 38775788043632640001
14 5700041141609893478399
15 1757631343928533032960001
16 327562346808114783805439999
17 126513546505547170185216000001

List of values

[1, 3, 37, 431, 14401, 403199, 25401601, 1216454399, 135339724801, 9877056537599, 1593350922240001, 178056522962841599, 38775788043632640001, 5700041141609893478399, 1757631343928533032960001, 327562346808114783805439999, 126513546505547170185216000001]

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

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