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A140590 as a simple table

na(n)
03
12
29
35
433
517
6129
765
8513
9257
102049
111025
128193
134097
1432769
1516385
16131073
1765537
18524289
19262145
202097153
211048577
228388609
234194305
2433554433
2516777217
26134217729
2767108865
28536870913
29268435457
302147483649
311073741825
328589934593
334294967297
3434359738369

[3,2,9,5,33,17,129,65,513,257,2049,1025,8193,4097,
 32769,16385,131073,65537,524289,262145,2097153,
 1048577,8388609,4194305,33554433,16777217,
 134217729,67108865,536870913,268435457,2147483649,
 1073741825,8589934593,4294967297,34359738369]