A012501 - OEIS

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A012501 as a simple table

n	a(n)
0	1
1	-1
2	21
3	-645
4	34153
5	-2966505
6	380114493
7	-67244074989
8	15717842398417
9	-4694489063253585
10	1744673430747688805
11	-789702534539438543573
12	427739642844597474379833
13	-273184203052102765688128825

[1,-1,21,-645,34153,-2966505,380114493, -67244074989,15717842398417,-4694489063253585, 1744673430747688805,-789702534539438543573, 427739642844597474379833, -273184203052102765688128825]