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A066972
as a simple table
n
a(n)
1
3
2
12
3
42
4
144
5
728
6
2688
7
10080
8
39312
9
127008
10
423360
11
2419200
12
6773760
13
32140800
[3,12,42,144,728,2688,10080,39312,127008,423360, 2419200,6773760,32140800]