A174782 - cp's OEIS frontend

A174782 Sum of the numerators for computing the fourth moment of the probability mass function for the number of involutions with k 2-cycles in n elements (A000085) assuming equal likelihood.

n	a(n)
1	0
2	1
3	3
4	54
5	250
6	1950
7	10206
8	64288
9	350064
10	2065500
11	11509300
12	66905256
13	380767608
14	2226036904
15	12949377000
16	76842172800
17	457297336576
18	2766381692688
19	16849247813424
20	104116268476000
21	649043824951200

[0, 1, 3, 54, 250, 1950, 10206, 64288, 350064, 2065500, 11509300, 66905256, 380767608, 2226036904, 12949377000, 76842172800, 457297336576, 2766381692688, 16849247813424, 104116268476000, 649043824951200]

cp's OEIS Frontend

A174782 Sum of the numerators for computing the fourth moment of the probability mass function for the number of involutions with k 2-cycles in n elements (A000085) assuming equal likelihood.

Table of values

List of values