A087961 - OEIS

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A087961 as a simple table

n	a(n)
0	1
1	1
2	-1
3	10
4	-159
5	3816
6	-125375
7	5309088
8	-278224975
9	17527766896
10	-1298909663199
11	111339963135600
12	-10892621058454487
13	1203078692663183064
14	-148666849777064966815
15	20397978159874089501496

[1,1,-1,10,-159,3816,-125375,5309088,-278224975, 17527766896,-1298909663199,111339963135600, -10892621058454487,1203078692663183064, -148666849777064966815,20397978159874089501496]