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A093775
as a simple table
n
a(n)
1
6
2
21
3
129
4
1290
5
20209
6
353018
7
7537961
8
173772587
9
4735433401
10
160157951005
[6,21,129,1290,20209,353018,7537961,173772587, 4735433401,160157951005]