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A329625
as a simple table
n
a(n)
0
0
1
1
2
5
3
7
4
23
5
31
6
63
7
127
8
383
9
511
10
1023
11
2047
12
4095
13
8191
[0,1,5,7,23,31,63,127,383,511,1023,2047,4095,8191]
