A174774 - cp's OEIS frontend

A174774 Sum of the numerators for computing the third moment of the probability mass function for probability of k pairs among the involutions on n elements (A000085) assuming equal likelihood.

n	a(n)
1	0
2	1
3	3
4	30
5	130
6	780
7	3696
8	19768
9	97560
10	510660
11	2603260
12	13754136
13	72333768
14	390339040
15	2116922640
16	11722194240
17	65521880896
18	372897624528
19	2146502657520
20	12558129505120
21	74371827119520
22	447090649997376

[0, 1, 3, 30, 130, 780, 3696, 19768, 97560, 510660, 2603260, 13754136, 72333768, 390339040, 2116922640, 11722194240, 65521880896, 372897624528, 2146502657520, 12558129505120, 74371827119520, 447090649997376]

cp's OEIS Frontend

A174774 Sum of the numerators for computing the third moment of the probability mass function for probability of k pairs among the involutions on n elements (A000085) assuming equal likelihood.

Table of values

List of values