A012004 - OEIS

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A012004 as a simple table

n	a(n)
0	0
1	-1
2	-2
3	-1
4	148
5	-61
6	-395702
7	-28299181
8	93652648
9	265509939239
10	14066899733398
11	-8605652824527001
12	-2442549938212838852
13	25891773268121861099
14	210295085697229695516898

[0,-1,-2,-1,148,-61,-395702,-28299181,93652648, 265509939239,14066899733398,-8605652824527001, -2442549938212838852,25891773268121861099, 210295085697229695516898]