A012542 - OEIS

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A012542 as a simple table

n	a(n)
0	1
1	0
2	12
3	240
4	8400
5	549120
6	53608896
7	7360813824
8	1377976654080
9	339091656130560
10	106266069932321792
11	41339215216164073472
12	19547389576904471367680
13	11040327077609014366371840

[1,0,12,240,8400,549120,53608896,7360813824, 1377976654080,339091656130560,106266069932321792, 41339215216164073472,19547389576904471367680, 11040327077609014366371840]