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A066081
as a simple table
n
a(n)
1
5
2
9
3
15
4
50943795
5
40874929095
6
616517522595975
7
93487500801880185
8
64606701602327559675
[5,9,15,50943795,40874929095,616517522595975, 93487500801880185,64606701602327559675]