A131525 - cp's OEIS frontend

A131525 Number of degree-2n permutations such that number of cycles of size 2k is odd (or zero) and number of cycles of size 2k-1 is even (or zero), for every k.

n	a(n)
0	1
1	2
2	13
3	371
4	17389
5	1369057
6	168362459
7	28396593031
8	6237698137129
9	1823043651343241
10	654314519766396223
11	288203550242534470051
12	151792464548141462268029
13	95104739612472479469277141
14	68849533918239714802762113739
15	58193958459903387205593351715847

[1, 2, 13, 371, 17389, 1369057, 168362459, 28396593031, 6237698137129, 1823043651343241, 654314519766396223, 288203550242534470051, 151792464548141462268029, 95104739612472479469277141, 68849533918239714802762113739, 58193958459903387205593351715847]

cp's OEIS Frontend

A131525 Number of degree-2n permutations such that number of cycles of size 2k is odd (or zero) and number of cycles of size 2k-1 is even (or zero), for every k.

Table of values

List of values