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A161749
as a simple table
n
a(n)
1
3
2
5
3
127
4
3299
5
1967249047
6
8191
7
30450469261
8
131071
9
524287
10
476562280296181
11
70358283824461
[3,5,127,3299,1967249047,8191,30450469261,131071, 524287,476562280296181,70358283824461]