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A009506 as a simple table

n a(n)
0 1
1 4
2 12
3 -296
4 -25200
5 -1885952
6 -163728576
7 -16916558720
8 -2050105730816
9 -282656394482688
10 -42100913802486784
11 -6025333851231979520
12 -461235714949468024832
13 265243699159867430764544

[1,4,12,-296,-25200,-1885952,-163728576,
 -16916558720,-2050105730816,-282656394482688,
 -42100913802486784,-6025333851231979520,
 -461235714949468024832,265243699159867430764544]

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Last modified December 8 07:37 EST 2021. Contains 349593 sequences. (Running on oeis4.)