A012517 - OEIS

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A012517 as a simple table

n	a(n)
0	1
1	0
2	0
3	0
4	12
5	-60
6	450
7	-2940
8	30800
9	-336672
10	4362120
11	-57707760
12	847204776
13	-13292039904
14	228041125312
15	-4172767915680
16	81658781501440
17	-1692115320051584
18	37160192133050304
19	-860809698597753216

[1,0,0,0,12,-60,450,-2940,30800,-336672,4362120, -57707760,847204776,-13292039904,228041125312, -4172767915680,81658781501440,-1692115320051584, 37160192133050304,-860809698597753216]