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A076737 as a simple table

na(n)
12
22
32
45
53
617
711
865
943
10257
11171
121025
13683
144097
152731
1616385
1710923
1865537
1943691
20262145
21174763
221048577
23699051
244194305
252796203
2616777217
2711184811
2867108865
2944739243
30268435457
31178956971
321073741825
33715827883
344294967297

[2,2,2,5,3,17,11,65,43,257,171,1025,683,4097,2731,
 16385,10923,65537,43691,262145,174763,1048577,
 699051,4194305,2796203,16777217,11184811,67108865,
 44739243,268435457,178956971,1073741825,715827883,
 4294967297]