A012034 - OEIS

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A012034 as a simple table

n	a(n)
0	1
1	1
2	1
3	-1
4	-7
5	1
6	121
7	111
8	-4271
9	-9407
10	262801
11	957791
12	-25257079
13	-131065791
14	3510517193
15	23876150351
16	-667413187039
17	-5645293077119
18	166471455235489
19	1689130316350143
20	-52750545434135399

[1,1,1,-1,-7,1,121,111,-4271,-9407,262801,957791, -25257079,-131065791,3510517193,23876150351, -667413187039,-5645293077119,166471455235489, 1689130316350143,-52750545434135399]