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A139291 as a simple table

n a(n)
1 1
2 7
3 127
4 2047
5 524287
6 8388607
7 2147483647
8 34359738367
9 8796093022207
10 36028797018963967
11 576460752303423487
12 2361183241434822606847
13 604462909807314587353087
14 9671406556917033397649407

[1,7,127,2047,524287,8388607,2147483647,
 34359738367,8796093022207,36028797018963967,
 576460752303423487,2361183241434822606847,
 604462909807314587353087,
 9671406556917033397649407]

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Last modified April 21 04:56 EDT 2019. Contains 322310 sequences. (Running on oeis4.)