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.

A130915 Number of permutations in the symmetric group S_n in which cycle lengths are odd and greater than 1.

Table of values

n a(n)
0 1
1 0
2 0
3 2
4 0
5 24
6 40
7 720
8 2688
9 42560
10 245376
11 4072320
12 31672960
13 569935872
14 5576263680
15 109492807424
16 1290701905920
17 27616577064960
18 380852962029568
19 8845627365089280
20 139696582370328576
21 3506062524305162240
22 62387728088875499520
23 1684340707284076756992

List of values

[1, 0, 0, 2, 0, 24, 40, 720, 2688, 42560, 245376, 4072320, 31672960, 569935872, 5576263680, 109492807424, 1290701905920, 27616577064960, 380852962029568, 8845627365089280, 139696582370328576, 3506062524305162240, 62387728088875499520, 1684340707284076756992]

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

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