A096642 - OEIS

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A096642 as a simple table

n	a(n)
0	1
1	1
2	2
3	1
4	3
5	-1
6	15
7	-78
8	632
9	-6049
10	68036
11	-878337
12	12817659
13	-208803098
14	3758607935
15	-74132077726
16	1590647874073

[1,1,2,1,3,-1,15,-78,632,-6049,68036,-878337, 12817659,-208803098,3758607935,-74132077726, 1590647874073]