A012791 - OEIS

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A012791 as a simple table

n	a(n)
0	1
1	6
2	148
3	9184
4	1066640
5	199000736
6	54431471040
7	20523724218880
8	10203766053312768
9	6467780044492713472
10	5090997086675585360896
11	4871968356294907783585792
12	5570589015199967686042095616

[1,6,148,9184,1066640,199000736,54431471040, 20523724218880,10203766053312768, 6467780044492713472,5090997086675585360896, 4871968356294907783585792, 5570589015199967686042095616]