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A343440 as a simple table

na(n)
11
21
33
47
515
627
763
8127
9255
10495
111023
122037
134095
148127
1516365
1632767
1765535
18130815
19262143
20524265
211048509
222096127
234194303
248388477
2516777215
2633550335
2767108863
28134217657
29268435455
30536854005
311073741823
322147483647
334294966269
348589869055
3517179869105

[1,1,3,7,15,27,63,127,255,495,1023,2037,4095,8127,
 16365,32767,65535,130815,262143,524265,1048509,
 2096127,4194303,8388477,16777215,33550335,
 67108863,134217657,268435455,536854005,1073741823,
 2147483647,4294966269,8589869055,17179869105]