A061572 - cp's OEIS frontend

A061572 a(n) = (n!)^2 * Sum_{k=1..n} 1/(k^2*(k-1)!).

n	a(n)
1	1
2	5
3	47
4	758
5	18974
6	683184
7	33476736
8	2142516144
9	173543847984
10	17354385161280
11	2099880608143680
12	302382807612606720
13	51102694487009537280
14	10016128119460096327680
15	2253628826878608852019200
16	576928979680925173791283200
17	166732475127787396148470732800

[1, 5, 47, 758, 18974, 683184, 33476736, 2142516144, 173543847984, 17354385161280, 2099880608143680, 302382807612606720, 51102694487009537280, 10016128119460096327680, 2253628826878608852019200, 576928979680925173791283200, 166732475127787396148470732800]

cp's OEIS Frontend

A061572 a(n) = (n!)^2 * Sum_{k=1..n} 1/(k^2*(k-1)!).

Table of values

List of values