cp's OEIS Frontend

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.

A088335 Number of permutations in the symmetric group S_n such that the size of their centralizer is even.

Table of values

n a(n)
0 0
1 0
2 2
3 4
4 16
5 96
6 576
7 4320
8 31872
9 298368
10 3052800
11 34387200
12 404029440
13 5339473920
14 75893207040
15 1139356108800
16 18079668633600
17 310896849715200
18 5654417758617600
19 107707364764876800
20 2145784566959308800
21 45252164164799692800
22 1003024255355781120000

List of values

[0, 0, 2, 4, 16, 96, 576, 4320, 31872, 298368, 3052800, 34387200, 404029440, 5339473920, 75893207040, 1139356108800, 18079668633600, 310896849715200, 5654417758617600, 107707364764876800, 2145784566959308800, 45252164164799692800, 1003024255355781120000]

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

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