A012378 - OEIS

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A012378 as a simple table

n	a(n)
0	0
1	2
2	12
3	430
4	26040
5	2661178
6	402231940
7	84456360742
8	23476965450736
9	8341678414816242
10	3686586514781799292
11	1982979948714026781726
12	1275341677617693817452200
13	966341800352400737116306986

[0,2,12,430,26040,2661178,402231940,84456360742, 23476965450736,8341678414816242, 3686586514781799292,1982979948714026781726, 1275341677617693817452200, 966341800352400737116306986]