A130275 - cp's OEIS frontend

A130275 Number of degree-n permutations such that number of cycles of size 2k is odd (or zero) for every k.

n	a(n)
0	1
1	1
2	2
3	6
4	21
5	105
6	675
7	4725
8	35805
9	322245
10	3236625
11	35602875
12	425872755
13	5536345815
14	77347084815
15	1160206272225
16	18403556596425
17	312860462139225
18	5643104418376425
19	107218983949152075
20	2136610763952639975
21	44868826043005439475
22	986129980012277775675

[1, 1, 2, 6, 21, 105, 675, 4725, 35805, 322245, 3236625, 35602875, 425872755, 5536345815, 77347084815, 1160206272225, 18403556596425, 312860462139225, 5643104418376425, 107218983949152075, 2136610763952639975, 44868826043005439475, 986129980012277775675]

cp's OEIS Frontend

A130275 Number of degree-n permutations such that number of cycles of size 2k is odd (or zero) for every k.

Table of values

List of values