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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.

A192983 a(n) is the number of pairs (g, h) of elements of the symmetric group S_n such that g and h have conjugates that commute.

Table of values

n a(n)
1 1
2 4
3 24
4 264
5 5640
6 151200
7 5722920
8 282868992
9 18371308032
10 1504791561600
11 148978034686800
12 18007146260231040
13 2528615024682544512
14 426310052282058252672
15 81830910530970671616000
16 18305445786667543107072000
17 4570435510076312321728158720

List of values

[1, 4, 24, 264, 5640, 151200, 5722920, 282868992, 18371308032, 1504791561600, 148978034686800, 18007146260231040, 2528615024682544512, 426310052282058252672, 81830910530970671616000, 18305445786667543107072000, 4570435510076312321728158720]

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

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