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A091697
as a simple table
n
a(n)
1
2
2
3
3
5
4
9
5
17
6
33
7
65
8
35
9
129
10
257
11
513
12
1025
13
2049
[2,3,5,9,17,33,65,35,129,257,513,1025,2049]