A012138 - OEIS

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A012138 as a simple table

n	a(n)
0	1
1	-1
2	-11
3	-349
4	-22455
5	-2465241
6	-416217603
7	-100729124469
8	-33198564667887
9	-14328891118054449
10	-7852649782447649403
11	-5329635152693662625805
12	-4388960085492355649955495

[1,-1,-11,-349,-22455,-2465241,-416217603, -100729124469,-33198564667887,-14328891118054449, -7852649782447649403,-5329635152693662625805, -4388960085492355649955495]