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A040176
as a simple table
n
a(n)
1
1
2
3
3
5
4
11
5
17
6
41
7
83
8
137
9
257
10
641
11
1097
12
2329
13
4369
14
10537
15
17477
16
35209
17
65537
[1,3,5,11,17,41,83,137,257,641,1097,2329,4369, 10537,17477,35209,65537]