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A257592
as a simple table
n
a(n)
3
1
4
3
5
5
6
7
7
17
8
27
9
51
10
91
11
183
12
309
13
617
14
1125
15
2097
16
3995
[1,3,5,7,17,27,51,91,183,309,617,1125,2097,3995]