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A283864 as a simple table

na(n)
01
13
27
315
429
563
6119
7255
8477
91023
101915
114091
127647
1316383
1430647
1565535
16122367
17262143
18490367
191048575
201957631
214194303
227847935
2316777215
2431326207
2567108863
26125566975
27268435455
28501219327
291073741823
302009071615
314294967295
328019509247

[1,3,7,15,29,63,119,255,477,1023,1915,4091,7647,
 16383,30647,65535,122367,262143,490367,1048575,
 1957631,4194303,7847935,16777215,31326207,
 67108863,125566975,268435455,501219327,1073741823,
 2009071615,4294967295,8019509247]