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A155850 as a simple table

na(n)
12
24
33
45
57
615
717
831
965
10129
11127
12449
13511
142561
151025
167937
1712799
1820481
198191
2028673
2165537
22131071
23458751
24360449
25966655
26524287
274194303
282097151
2929360129
3034865153
3167108865
32134217729
3333554431
34608174081
35268435457
36536870911
374831838207

[2,4,3,5,7,15,17,31,65,129,127,449,511,2561,1025,
 7937,12799,20481,8191,28673,65537,131071,458751,
 360449,966655,524287,4194303,2097151,29360129,
 34865153,67108865,134217729,33554431,608174081,
 268435457,536870911,4831838207]