A130268 - cp's OEIS frontend

A130268 Number of degree-2n permutations such that number of cycles of size k is even (or zero) for every k.

n	a(n)
0	1
1	1
2	4
3	86
4	2696
5	168232
6	15948032
7	2172623168
8	398846422144
9	97541017510784
10	29909993927387648
11	11447388459863715328
12	5284740632299379566592
13	2927671399386587378671616
14	1897593132067741963020476416
15	1437515129453860805943287939072

[1, 1, 4, 86, 2696, 168232, 15948032, 2172623168, 398846422144, 97541017510784, 29909993927387648, 11447388459863715328, 5284740632299379566592, 2927671399386587378671616, 1897593132067741963020476416, 1437515129453860805943287939072]

cp's OEIS Frontend

A130268 Number of degree-2n permutations such that number of cycles of size k is even (or zero) for every k.

Table of values

List of values