A012670 - OEIS

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A012670 as a simple table

n	a(n)
0	2
1	-128
2	253952
3	-2863136768
4	107451055603712
5	-10140668012798148608
6	2022780765718183801782272
7	-757569427466144902069404827648

[2,-128,253952,-2863136768,107451055603712, -10140668012798148608,2022780765718183801782272, -757569427466144902069404827648]