A191462 - OEIS

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A191462 as a simple table

n	a(n)
0	1
1	1
2	0
3	6
4	12
5	100
6	780
7	-1092
8	43344
9	48816
10	1264320
11	24662880
12	-162851040
13	4327633440
14	-17686783296
15	275230488960
16	3743721112320
17	-70886371933440
18	2127136959383040
19	-25991855154846720
20	402985066993459200

[1,1,0,6,12,100,780,-1092,43344,48816,1264320, 24662880,-162851040,4327633440,-17686783296, 275230488960,3743721112320,-70886371933440, 2127136959383040,-25991855154846720, 402985066993459200]