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A290869 as a simple table

na(n)
14095
232767
365535
467053
5262143
6265720
7531440
81048575
92097151
104381419
115592405
127174453
139808617
1411184810
1513938267
1614348906
1716777215
1819617234
1921523360
2029425851
2139234468
2243046720
2348686547
2449043085
2558851702
2661035156
2768660319
2871270178

[4095,32767,65535,67053,262143,265720,531440,
 1048575,2097151,4381419,5592405,7174453,9808617,
 11184810,13938267,14348906,16777215,19617234,
 21523360,29425851,39234468,43046720,48686547,
 49043085,58851702,61035156,68660319,71270178]