A105097 - OEIS

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A105097 as a simple table

n	a(n)
1	1
2	-504
3	180252
4	-56364992
5	16415391870
6	-4574618335008
7	1237162549543256
8	-327377686829760000
9	85212608926827807477
10	-21894492009015306942480
11	5567179862617316105012532
12	-1403483985988949037403977984

[1,-504,180252,-56364992,16415391870, -4574618335008,1237162549543256, -327377686829760000,85212608926827807477, -21894492009015306942480, 5567179862617316105012532, -1403483985988949037403977984]