A012836 - OEIS

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A012836 as a simple table

n	a(n)
0	1
1	0
2	20
3	-280
4	18000
5	-1277760
6	159922880
7	-26119949440
8	5923118588160
9	-1705199348152320
10	619341836139299840
11	-274598298613483878400
12	146431095418622106193920
13	-92305017354779154307399680

[1,0,20,-280,18000,-1277760,159922880, -26119949440,5923118588160,-1705199348152320, 619341836139299840,-274598298613483878400, 146431095418622106193920, -92305017354779154307399680]