A012116 - OEIS

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A012116 as a simple table

n	a(n)
0	1
1	1
2	9
3	113
4	6993
5	171777
6	45264153
7	412458993
8	1241225427105
9	-81335384742015
10	102955176831541545
11	-22142143528417205775
12	20775502075935299781105
13	-8945394343172069982368895

[1,1,9,113,6993,171777,45264153,412458993, 1241225427105,-81335384742015,102955176831541545, -22142143528417205775,20775502075935299781105, -8945394343172069982368895]