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A121892
as a simple table
n
a(n)
0
1
1
2
2
4
3
24
4
192
5
1920
6
23040
7
322560
8
5160960
9
92897280
10
1857945600
11
40874803200
12
980995276800
[1,2,4,24,192,1920,23040,322560,5160960,92897280, 1857945600,40874803200,980995276800]