A202013 - cp's OEIS frontend

A202013 The number of functions f:{1,2,...,n}->{1,2,...,n} that have an odd number of odd length cycles and no even length cycles.

n	a(n)
0	0
1	1
2	2
3	12
4	100
5	1120
6	15606
7	260344
8	5056136
9	112026240
10	2788230250
11	77009739136
12	2337124786668
13	77302709780608
14	2767629599791070
15	106631592312384000
16	4398877912885363216
17	193450993635808976896
18	9034380526387410161874
19	446519425974262943518720
20	23284829853408862172112500

[0, 1, 2, 12, 100, 1120, 15606, 260344, 5056136, 112026240, 2788230250, 77009739136, 2337124786668, 77302709780608, 2767629599791070, 106631592312384000, 4398877912885363216, 193450993635808976896, 9034380526387410161874, 446519425974262943518720, 23284829853408862172112500]

cp's OEIS Frontend

A202013 The number of functions f:{1,2,...,n}->{1,2,...,n} that have an odd number of odd length cycles and no even length cycles.

Table of values

List of values