A131526 - cp's OEIS frontend

A131526 Number of degree-n permutations such that number of cycles of size 2k is even (or zero) and number of cycles of size 2k-1 is odd (or zero), for every k.

n	a(n)
0	1
1	1
2	0
3	3
4	11
5	40
6	184
7	1036
8	12949
9	88488
10	807008
11	7362586
12	113572183
13	1238477032
14	15630890560
15	228998728050
16	4141605806441
17	62222251093216
18	1030119451142656
19	19050688698470434
20	412037845709792107
21	8102391640556570616
22	165794307361686866432

[1, 1, 0, 3, 11, 40, 184, 1036, 12949, 88488, 807008, 7362586, 113572183, 1238477032, 15630890560, 228998728050, 4141605806441, 62222251093216, 1030119451142656, 19050688698470434, 412037845709792107, 8102391640556570616, 165794307361686866432]

cp's OEIS Frontend

A131526 Number of degree-n permutations such that number of cycles of size 2k is even (or zero) and number of cycles of size 2k-1 is odd (or zero), for every k.

Table of values

List of values