A012247 - OEIS

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A012247 as a simple table

n	a(n)
0	1
1	1
2	1
3	0
4	-3
5	-4
6	21
7	136
8	185
9	-7408
10	-67159
11	644416
12	11805621
13	-84562880
14	-2380474563
15	15811723136
16	591392066161
17	-4005496370944
18	-181472052075695
19	1317763889887232
20	68002767860495981

[1,1,1,0,-3,-4,21,136,185,-7408,-67159,644416, 11805621,-84562880,-2380474563,15811723136, 591392066161,-4005496370944,-181472052075695, 1317763889887232,68002767860495981]