A012778 - OEIS

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A012778 as a simple table

n	a(n)
0	1
1	0
2	1
3	-3
4	28
5	-160
6	1630
7	-14700
8	180668
9	-2227608
10	32850740
11	-507842060
12	8829277928
13	-162974579040
14	3280768459280
15	-70166399557800
16	1609085392223312
17	-39068177212368192
18	1006531896581760976

[1,0,1,-3,28,-160,1630,-14700,180668,-2227608, 32850740,-507842060,8829277928,-162974579040, 3280768459280,-70166399557800,1609085392223312, -39068177212368192,1006531896581760976]