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A165804 as a simple table

na(n)
10
21
32
43
54
65
76
87
915
1023
1131
1239
1347
1455
1563
16127
17191
18255
19319
20383
21447
22511
231023
241535
252047
262559
273071
283583
294095
308191
3112287
3216383
3320479
3424575
3528671
3632767
3765535
3898303
39131071
40163839
41196607
42229375
43262143
44524287
45786431
461048575
471310719
481572863
491835007
502097151

[0,1,2,3,4,5,6,7,15,23,31,39,47,55,63,127,191,255,
 319,383,447,511,1023,1535,2047,2559,3071,3583,
 4095,8191,12287,16383,20479,24575,28671,32767,
 65535,98303,131071,163839,196607,229375,262143,
 524287,786431,1048575,1310719,1572863,1835007,
 2097151]