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A003527
as a simple table
n
a(n)
1
1
2
3
3
5
4
15
5
17
6
51
7
85
8
255
9
257
10
771
11
1285
12
3855
13
4369
14
13107
15
21845
16
65535
[1,3,5,15,17,51,85,255,257,771,1285,3855,4369, 13107,21845,65535]