A304654 - cp's OEIS frontend

A304654 a(n) = (n!)^2 * Sum_{k=1..n-1} 1/(k^2*(n-k)).

n	a(n)
0	0
1	0
2	4
3	27
4	328
5	6500
6	192216
7	7952112
8	438941952
9	31185057024
10	2772643115520
11	301622403456000
12	39413353102848000
13	6091955683706880000
14	1099401414283210752000
15	229088914497045356544000
16	54589580461769879715840000
17	14750581694440372638842880000

[0, 0, 4, 27, 328, 6500, 192216, 7952112, 438941952, 31185057024, 2772643115520, 301622403456000, 39413353102848000, 6091955683706880000, 1099401414283210752000, 229088914497045356544000, 54589580461769879715840000, 14750581694440372638842880000]

cp's OEIS Frontend

A304654 a(n) = (n!)^2 * Sum_{k=1..n-1} 1/(k^2*(n-k)).

Table of values

List of values