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A168642 as a simple table

na(n)
01
15
211
321
443
585
6171
7341
8683
91365
102731
115461
1210923
1321845
1443691
1587381
16174763
17349525
18699051
191398101
202796203
215592405
2211184811
2322369621
2444739243
2589478485
26178956971
27357913941
28715827883
291431655765
302863311531

[1,5,11,21,43,85,171,341,683,1365,2731,5461,10923,
 21845,43691,87381,174763,349525,699051,1398101,
 2796203,5592405,11184811,22369621,44739243,
 89478485,178956971,357913941,715827883,1431655765,
 2863311531]