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A133024
as a simple table
n
a(n)
1
1
2
2
3
4
4
8
5
16
6
32
7
64
8
127
9
254
10
508
11
1016
12
2032
13
4064
14
8128
[1,2,4,8,16,32,64,127,254,508,1016,2032,4064,8128]