A012566 - OEIS

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A012566 as a simple table

n	a(n)
0	1
1	-1
2	-15
3	-201
4	1025
5	505199
6	45962865
7	672778599
8	-885967354495
9	-245542561428001
10	-22172563647911055
11	14487811265589717399
12	9628380148436165613185
13	2365618724494349248126799

[1,-1,-15,-201,1025,505199,45962865,672778599, -885967354495,-245542561428001,-22172563647911055, 14487811265589717399,9628380148436165613185, 2365618724494349248126799]