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A087323 as a simple table

na(n)
00
13
211
331
479
5191
6447
71023
82303
95119
1011263
1124575
1253247
13114687
14245759
15524287
161114111
172359295
184980735
1910485759
2022020095
2146137343
2296468991
23201326591
24419430399
25872415231
261811939327
273758096383
287784628223
2916106127359
3033285996543
3168719476735

[0,3,11,31,79,191,447,1023,2303,5119,11263,24575,
 53247,114687,245759,524287,1114111,2359295,
 4980735,10485759,22020095,46137343,96468991,
 201326591,419430399,872415231,1811939327,
 3758096383,7784628223,16106127359,33285996543,
 68719476735]