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A283606 as a simple table

na(n)
01
13
27
315
429
563
6119
7255
8477
91023
101915
114095
127667
1316383
1430715
1565535
16122879
17262143
18491519
191048575
201966079
214194303
227864319
2316777215
2431457279
2567108863
26125829119
27268435455
28503316479
291073741823
302013265919
314294967295
328053063679

[1,3,7,15,29,63,119,255,477,1023,1915,4095,7667,
 16383,30715,65535,122879,262143,491519,1048575,
 1966079,4194303,7864319,16777215,31457279,
 67108863,125829119,268435455,503316479,1073741823,
 2013265919,4294967295,8053063679]