A009505 - OEIS

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A009505 as a simple table

n	a(n)
0	1
1	-2
2	-8
3	-184
4	-5568
5	-231552
6	-11751296
7	-596164352
8	-4342886400
9	10035384119296
10	3825733461393408
11	1266087931055144960
12	431690972162311487488
13	158346541732411570847744
14	63296242766270753646313472

[1,-2,-8,-184,-5568,-231552,-11751296,-596164352, -4342886400,10035384119296,3825733461393408, 1266087931055144960,431690972162311487488, 158346541732411570847744, 63296242766270753646313472]