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A069111 as a simple table

na(n)
02
13
25
31
417
533
665
7129
8257
957
1041
112049
124097
138193
1416385
153641
1665537
17131073
18262145
19524289
201048577
21233017
224194305
238388609
2416777217
2533554433
2667108865
271657009
28268435457
29536870913
3042949673
312147483649
324294967297
33954437177
3417179869185

[2,3,5,1,17,33,65,129,257,57,41,2049,4097,8193,
 16385,3641,65537,131073,262145,524289,1048577,
 233017,4194305,8388609,16777217,33554433,67108865,
 1657009,268435457,536870913,42949673,2147483649,
 4294967297,954437177,17179869185]