A346409 - cp's OEIS frontend

A346409 a(n) = (n!)^2 * Sum_{k=0..n-1} (-1)^k / ((n-k)^2 * k!).

n	a(n)
0	0
1	1
2	-3
3	13
4	-52
5	476
6	1344
7	156192
8	6935424
9	470168064
10	38948065920
11	3979380286080
12	489922581219840
13	71586095491054080
14	12249193741572372480
15	2426646293132502067200
16	551096248249459158220800
17	142236660450422499604070400
18	41404182857569072540171468800

[0, 1, -3, 13, -52, 476, 1344, 156192, 6935424, 470168064, 38948065920, 3979380286080, 489922581219840, 71586095491054080, 12249193741572372480, 2426646293132502067200, 551096248249459158220800, 142236660450422499604070400, 41404182857569072540171468800]

cp's OEIS Frontend

A346409 a(n) = (n!)^2 * Sum_{k=0..n-1} (-1)^k / ((n-k)^2 * k!).

Table of values

List of values