A012638 - OEIS

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A012638 as a simple table

n	a(n)
0	1
1	-6
2	128
3	-7784
4	863168
5	-153777536
6	40156766336
7	-14452100967680
8	6857570007949312
9	-4148412279035834368
10	3116288727548544729088
11	-2846053921629037944078336
12	3105570670613041972460814336

[1,-6,128,-7784,863168,-153777536,40156766336, -14452100967680,6857570007949312, -4148412279035834368,3116288727548544729088, -2846053921629037944078336, 3105570670613041972460814336]