A372579 - cp's OEIS frontend

A372579 Number of permutations of [n] such that the number of cycles of length k is zero or equals k for every k.

n	a(n)
0	1
1	1
2	0
3	0
4	3
5	15
6	0
7	0
8	0
9	2240
10	22400
11	0
12	0
13	4804800
14	67267200
15	0
16	3405402000
17	57891834000
18	0
19	0
20	49497518070000
21	1039447879470000
22	0
23	0
24	0
25	56947245360343962624
26	1480628379368943028224
27	0
28	0
29	4057662073660588368847872
30	121729862209817651065436160
31	0
32	0
33	0

[1, 1, 0, 0, 3, 15, 0, 0, 0, 2240, 22400, 0, 0, 4804800, 67267200, 0, 3405402000, 57891834000, 0, 0, 49497518070000, 1039447879470000, 0, 0, 0, 56947245360343962624, 1480628379368943028224, 0, 0, 4057662073660588368847872, 121729862209817651065436160, 0, 0, 0]

cp's OEIS Frontend

A372579 Number of permutations of [n] such that the number of cycles of length k is zero or equals k for every k.

Table of values

List of values