A156325 - OEIS

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A156325 as a simple table

n	a(n)
0	1
1	1
2	4
3	34
4	482
5	10056
6	286372
7	10591372
8	491169996
9	27826318000
10	1887581200256
11	150885500428224
12	14028718134958936
13	1500672248541122944
14	182987661921689610000
15	25231215606822797450176

[1,1,4,34,482,10056,286372,10591372,491169996, 27826318000,1887581200256,150885500428224, 14028718134958936,1500672248541122944, 182987661921689610000,25231215606822797450176]