A013450 - OEIS

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A013450 as a simple table

n	a(n)
0	1
1	0
2	0
3	3
4	0
5	7
6	90
7	497
8	1176
9	4471
10	185094
11	1537877
12	1964028
13	-3633797
14	1848048202
15	22918664225
16	-75962374768
17	-1620122697905
18	67890529994062
19	1135357942624877
20	-11941170933349628
21	-252473078493886301

[1,0,0,3,0,7,90,497,1176,4471,185094,1537877, 1964028,-3633797,1848048202,22918664225, -75962374768,-1620122697905,67890529994062, 1135357942624877,-11941170933349628, -252473078493886301]