A151883 - cp's OEIS frontend

A151883 Let g be a permutation of [1..n] having say j_i cycles of length i, with Sum_i i*j_i = n; sequence gives Sum_g Sum_{i even} (j_i)^2.

n	a(n)
1	0
2	1
3	3
4	24
5	120
6	840
7	5880
8	54600
9	491400
10	5276880
11	58045680
12	749770560
13	9747017280
14	142685262720
15	2140278940800
16	35879056012800
17	609943952217600
18	11334678568012800
19	215358892792243200
20	4453151976335462400
21	93516191503044710400
22	2108447155238693068800

[0, 1, 3, 24, 120, 840, 5880, 54600, 491400, 5276880, 58045680, 749770560, 9747017280, 142685262720, 2140278940800, 35879056012800, 609943952217600, 11334678568012800, 215358892792243200, 4453151976335462400, 93516191503044710400, 2108447155238693068800]

cp's OEIS Frontend

A151883 Let g be a permutation of [1..n] having say j_i cycles of length i, with Sum_i i*j_i = n; sequence gives Sum_g Sum_{i even} (j_i)^2.

Table of values

List of values