A012011 - OEIS

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A012011 as a simple table

n	a(n)
0	1
1	-3
2	41
3	-1515
4	113489
5	-14321299
6	2716798969
7	-721988679547
8	255890614389921
9	-116619928299347491
10	66439023428917759945
11	-46262911349611152912395
12	38656874720522348065089521

[1,-3,41,-1515,113489,-14321299,2716798969, -721988679547,255890614389921,-116619928299347491, 66439023428917759945,-46262911349611152912395, 38656874720522348065089521]