A013281 - OEIS

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A013281 as a simple table

n	a(n)
0	1
1	0
2	0
3	0
4	-3
5	30
6	-180
7	945
8	-6615
9	56700
10	-368550
11	1091475
12	3274425
13	-85135050
14	3235131900
15	-86199238125
16	1340238524625
17	-15196606425000
18	229968074085750
19	-4642248475990125
20	57810007510880625

[1,0,0,0,-3,30,-180,945,-6615,56700,-368550, 1091475,3274425,-85135050,3235131900,-86199238125, 1340238524625,-15196606425000,229968074085750, -4642248475990125,57810007510880625]