A012211 - OEIS

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A012211 as a simple table

n	a(n)
0	1
1	-1
2	21
3	-1149
4	119305
5	-20082841
6	4984310493
7	-1711500674389
8	776816116717457
9	-450301381427975089
10	324553968807761095973
11	-284661632752853556677805
12	298518404617173649259722905

[1,-1,21,-1149,119305,-20082841,4984310493, -1711500674389,776816116717457, -450301381427975089,324553968807761095973, -284661632752853556677805, 298518404617173649259722905]