A009713 - OEIS

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A009713 as a simple table

n	a(n)
0	1
1	2
2	8
3	-176
4	-16384
5	-969728
6	-32455680
7	4303626240
8	1468506210304
9	269552004300800
10	24649152071991296
11	-7396863878894714880
12	-5630959968640999358464
13	-2114449853843696991076352

[1,2,8,-176,-16384,-969728,-32455680,4303626240, 1468506210304,269552004300800,24649152071991296, -7396863878894714880,-5630959968640999358464, -2114449853843696991076352]