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A127904 as a simple table

na(n)
00
11
23
35
49
517
633
765
8129
9257
10513
111025
122049
134097
148193
1516385
1632769
1765537
18131073
19262145
20524289
211048577
222097153
234194305
248388609
2516777217
2633554433
2767108865
28134217729
29268435457
30536870913
311073741825
322147483649

[0,1,3,5,9,17,33,65,129,257,513,1025,2049,4097,
 8193,16385,32769,65537,131073,262145,524289,
 1048577,2097153,4194305,8388609,16777217,33554433,
 67108865,134217729,268435457,536870913,1073741825,
 2147483649]