A012110 - OEIS

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A012110 as a simple table

n	a(n)
0	1
1	-1
2	-3
3	-21
4	-1543
5	-139241
6	-17567883
7	-3247844861
8	-820544875023
9	-270409929116881
10	-112752402237298963
11	-58042577464009155301
12	-36153625550535244615703
13	-26800108152000698851560121

[1,-1,-3,-21,-1543,-139241,-17567883,-3247844861, -820544875023,-270409929116881, -112752402237298963,-58042577464009155301, -36153625550535244615703, -26800108152000698851560121]