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A120094
as a simple table
n
a(n)
1
7
2
15
3
31
4
63
5
81
6
127
7
239
8
255
9
470
10
511
11
1023
12
2047
13
4095
[7,15,31,63,81,127,239,255,470,511,1023,2047,4095]