A009099 - OEIS

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A009099 as a simple table

n	a(n)
0	1
1	-2
2	0
3	-8
4	192
5	20480
6	1837696
7	187743488
8	22698672128
9	3236847570944
10	536307107184640
11	101121059849109504
12	21095686709291679744
13	4655115962946721611776
14	983762698552391462027264

[1,-2,0,-8,192,20480,1837696,187743488, 22698672128,3236847570944,536307107184640, 101121059849109504,21095686709291679744, 4655115962946721611776,983762698552391462027264]