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A309260
as a simple table
n
a(n)
1
1
2
1
3
1
4
5
5
29
6
224
7
3012
8
55200
9
1259794
10
35488536
11
1200819600
[1,1,1,5,29,224,3012,55200,1259794,35488536, 1200819600]