A012447 - OEIS

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A012447 as a simple table

n	a(n)
0	0
1	2
2	0
3	-80
4	-2688
5	260608
6	2928640
7	-463763456
8	-517376835584
9	108823739498496
10	-2683131538178048
11	5868236283429519360
12	-6862655376791380688896
13	2738386568702639562817536

[0,2,0,-80,-2688,260608,2928640,-463763456, -517376835584,108823739498496,-2683131538178048, 5868236283429519360,-6862655376791380688896, 2738386568702639562817536]