A009712 - OEIS

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A009712 as a simple table

n	a(n)
0	1
1	-1
2	-7
3	391
4	-17263
5	680239
6	1450569
7	-7957325193
8	2085950965153
9	-451440698199841
10	87302333394141977
11	-12244874410272223257
12	-1227047210877649641679
13	2438662572717698729224975

[1,-1,-7,391,-17263,680239,1450569,-7957325193, 2085950965153,-451440698199841,87302333394141977, -12244874410272223257,-1227047210877649641679, 2438662572717698729224975]