A012986 - OEIS

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A012986 as a simple table

n	a(n)
0	2
1	-9
2	105
3	-4095
4	235305
5	-24792075
6	3350672325
7	-682570263375
8	167108397080625
9	-55823919598321875
10	21575234944726588125
11	-10710021193954531824375
12	5999211692915481431015625

[2,-9,105,-4095,235305,-24792075,3350672325, -682570263375,167108397080625,-55823919598321875, 21575234944726588125,-10710021193954531824375, 5999211692915481431015625]