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A093535
as a simple table
n
a(n)
1
3
2
7
3
31
4
127
5
3583
6
8191
7
131071
8
524287
9
14680063
10
1073479679
11
2147483647
[3,7,31,127,3583,8191,131071,524287,14680063, 1073479679,2147483647]