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A147733
as a simple table
n
a(n)
1
1
2
2
3
6
4
24
5
120
6
624
7
4176
8
31564
9
271972
10
2654974
11
28246094
12
320329694
13
4116736768
14
54680271878
[1,2,6,24,120,624,4176,31564,271972,2654974, 28246094,320329694,4116736768,54680271878]