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A116659
as a simple table
n
a(n)
1
1
2
3
3
9
4
23
5
81
6
85
7
87
8
16057
9
4124457
10
27067011
11
27067127
12
1208198605
13
1208198851
[1,3,9,23,81,85,87,16057,4124457,27067011, 27067127,1208198605,1208198851]