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A264734
as a simple table
n
a(n)
1
3
2
5
3
7
4
9
5
11
6
25
7
27
8
29
9
81
10
241
11
59051
12
450283905890997361
13
36472996377170786401
[3,5,7,9,11,25,27,29,81,241,59051, 450283905890997361,36472996377170786401]