A067550 - cp's OEIS frontend

A067550 a(n) = (n-1)!(n+2)!/(3*2^n).

n	a(n)
1	1
2	2
3	10
4	90
5	1260
6	25200
7	680400
8	23814000
9	1047816000
10	56582064000
11	3677834160000
12	283193230320000
13	25487390728800000
14	2650688635795200000
15	315431947659628800000
16	42583312934049888000000
17	6472663565975582976000000
18	1100352806215849105920000000

[1, 2, 10, 90, 1260, 25200, 680400, 23814000, 1047816000, 56582064000, 3677834160000, 283193230320000, 25487390728800000, 2650688635795200000, 315431947659628800000, 42583312934049888000000, 6472663565975582976000000, 1100352806215849105920000000]

cp's OEIS Frontend

A067550 a(n) = (n-1)!(n+2)!/(3*2^n).

Table of values

List of values