A336291 - cp's OEIS frontend

A336291 a(n) = (n!)^2 * Sum_{k=1..n} 1 / (k * ((n-k)!)^2).

n	a(n)
0	0
1	1
2	6
3	39
4	424
5	7905
6	227766
7	9324511
8	512970144
9	36452217969
10	3247711402870
11	354391640998791
12	46474986465907176
13	7210874466760191409
14	1306387103147257800774
15	273269900360634449732895
16	65363179181419926246184576
17	17726298367452515070739268001

[0, 1, 6, 39, 424, 7905, 227766, 9324511, 512970144, 36452217969, 3247711402870, 354391640998791, 46474986465907176, 7210874466760191409, 1306387103147257800774, 273269900360634449732895, 65363179181419926246184576, 17726298367452515070739268001]

cp's OEIS Frontend

A336291 a(n) = (n!)^2 * Sum_{k=1..n} 1 / (k * ((n-k)!)^2).

Table of values

List of values