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A290235 as a simple table

na(n)
01
11
27
33
431
57
6127
715
8511
931
102047
1163
128191
13127
1432767
15255
16131071
17511
18524287
191023
202097151
212047
228388607
234095
2433554431
258191
26134217727
2716383
28536870911
2932767
302147483647
3165535
328589934591
33131071
3434359738367
35262143
36137438953471

[1,1,7,3,31,7,127,15,511,31,2047,63,8191,127,
 32767,255,131071,511,524287,1023,2097151,2047,
 8388607,4095,33554431,8191,134217727,16383,
 536870911,32767,2147483647,65535,8589934591,
 131071,34359738367,262143,137438953471]