A139085 - OEIS

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A139085 as a simple table

n	a(n)
1	1
2	1
3	-2
4	15
5	-158
6	2058
7	-31148
8	529209
9	-9882430
10	200035242
11	-4346788764
12	100697241762
13	-2473869382964
14	64191822293220
15	-1753530264442280
16	50293662225989739
17	-1511101241900117982
18	47467602491174747046

[1,1,-2,15,-158,2058,-31148,529209,-9882430, 200035242,-4346788764,100697241762,-2473869382964, 64191822293220,-1753530264442280, 50293662225989739,-1511101241900117982, 47467602491174747046]