A015495 - OEIS

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A015495 as a simple table

n	a(n)
0	1
1	7
2	50
3	2500
4	860000
5	2065720000
6	34720621760000
7	4084881150064000000
8	3364079361848306816000000
9	19393251433341842829490432000000
10	782587666186514855538867732678656000000

[1,7,50,2500,860000,2065720000,34720621760000, 4084881150064000000,3364079361848306816000000, 19393251433341842829490432000000, 782587666186514855538867732678656000000]