A130648 - cp's OEIS frontend

A130648 Number of degree-n permutations without even cycles and such that 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	8
5	25
6	184
7	721
8	9904
9	66753
10	691088
11	5973121
12	84925048
13	940427137
14	12801319816
15	186556383105
16	3174772979936
17	48489077948161
18	842173637012896
19	15359492773456129
20	316965131969908072
21	6368424993521096961
22	135098381153771956952
23	2980219360336428021505

[1, 1, 0, 3, 8, 25, 184, 721, 9904, 66753, 691088, 5973121, 84925048, 940427137, 12801319816, 186556383105, 3174772979936, 48489077948161, 842173637012896, 15359492773456129, 316965131969908072, 6368424993521096961, 135098381153771956952, 2980219360336428021505]

cp's OEIS Frontend

A130648 Number of degree-n permutations without even cycles and such that number of cycles of size 2k-1 is odd (or zero) for every k.

Table of values

List of values