A012086 - OEIS

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A012086 as a simple table

n	a(n)
0	1
1	-1
2	-7
3	-121
4	-5167
5	-487441
6	-78804727
7	-18558463561
8	-5919443326687
9	-2457116797560481
10	-1289150916753299047
11	-834798631079038210201
12	-654139310316332313889807
13	-610085118687493622960844721

[1,-1,-7,-121,-5167,-487441,-78804727, -18558463561,-5919443326687,-2457116797560481, -1289150916753299047,-834798631079038210201, -654139310316332313889807, -610085118687493622960844721]