A130644 - cp's OEIS frontend

A130644 Number of degree-2n permutations without odd cycles and such that number of cycles of size 2k is odd (or zero) for every k.

n	a(n)
0	1
1	1
2	6
3	225
4	8400
5	760725
6	91725480
7	15563633085
8	3381661483200
9	1015992072520425
10	360153767651277600
11	160068908768727783825
12	84298688029883001074400
13	53051020433282263735468125
14	38316864396320965168213500000
15	32660810942813910822645908353125

[1, 1, 6, 225, 8400, 760725, 91725480, 15563633085, 3381661483200, 1015992072520425, 360153767651277600, 160068908768727783825, 84298688029883001074400, 53051020433282263735468125, 38316864396320965168213500000, 32660810942813910822645908353125]

cp's OEIS Frontend

A130644 Number of degree-2n permutations without odd cycles and such that number of cycles of size 2k is odd (or zero) for every k.

Table of values

List of values