A302827 - cp's OEIS frontend

A302827 a(n) = (n!)^2 * Sum_{k=1..n-1} 1/(k*(n-k))^2.

n	a(n)
0	0
1	0
2	4
3	18
4	164
5	2600
6	64072
7	2272032
8	109735488
9	6930012672
10	554528623104
11	54840436992000
12	6568892183808000
13	937223951339520000
14	157057344897601536000
15	30545188599606047539200
16	6823697557721234964480000
17	1735362552287102663393280000

[0, 0, 4, 18, 164, 2600, 64072, 2272032, 109735488, 6930012672, 554528623104, 54840436992000, 6568892183808000, 937223951339520000, 157057344897601536000, 30545188599606047539200, 6823697557721234964480000, 1735362552287102663393280000]

cp's OEIS Frontend

A302827 a(n) = (n!)^2 * Sum_{k=1..n-1} 1/(k*(n-k))^2.

Table of values

List of values