A009682 - OEIS

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A009682 as a simple table

n	a(n)
0	0
1	2
2	8
3	168
4	6208
5	365984
6	31759232
7	3799039104
8	599327352832
9	120551382086144
10	30112348370954240
11	9144842254707320832
12	3318219571077818269696
13	1417778434388262802202624

[0,2,8,168,6208,365984,31759232,3799039104, 599327352832,120551382086144,30112348370954240, 9144842254707320832,3318219571077818269696, 1417778434388262802202624]