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A067684
as a simple table
n
a(n)
1
2
2
16
3
130
4
192
5
448
6
1120
7
13468
8
23296
9
7176640
10
135939072
11
581150416
12
3259721920
13
9517877824
14
21538220800
[2,16,130,192,448,1120,13468,23296,7176640, 135939072,581150416,3259721920,9517877824, 21538220800]