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A289408 as a simple table

na(n)
01
12
27
314
429
563
6127
7255
8499
91023
102039
114091
128191
1316371
1432767
1565531
16130823
17262139
18524087
191048523
202097143
214194107
228388519
2316777147
2433554367
2567108795
26134217663
27268435131
28536870847
291073741755
302147483327
314294967227
328589871039

[1,2,7,14,29,63,127,255,499,1023,2039,4091,8191,
 16371,32767,65531,130823,262139,524087,1048523,
 2097143,4194107,8388519,16777147,33554367,
 67108795,134217663,268435131,536870847,1073741755,
 2147483327,4294967227,8589871039]