A012797 - OEIS

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A012797 as a simple table

n	a(n)
0	1
1	4
2	20
3	-296
4	-13360
5	1256704
6	189575360
7	-11506868096
8	-7128426008320
9	49808403426304
10	682296985566233600
11	90438749300061435904
12	-128380014279650042490880
13	-53104829106323270490423296

[1,4,20,-296,-13360,1256704,189575360, -11506868096,-7128426008320,49808403426304, 682296985566233600,90438749300061435904, -128380014279650042490880, -53104829106323270490423296]