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A180516 as a simple table

na(n)
10
21
32
43
57
611
715
831
947
1063
11127
12191
13255
14511
15767
161023
172047
183071
194095
208191
2112287
2216383
2332767
2449151
2565535
26131071
27196607
28262143
29524287
30786431
311048575
322097151
333145727
344194303
358388607
3612582911
3716777215
3833554431
3950331647
4067108863
41134217727
42201326591
43268435455
44536870911
45805306367
461073741823
472147483647
483221225471

[0,1,2,3,7,11,15,31,47,63,127,191,255,511,767,
 1023,2047,3071,4095,8191,12287,16383,32767,49151,
 65535,131071,196607,262143,524287,786431,1048575,
 2097151,3145727,4194303,8388607,12582911,16777215,
 33554431,50331647,67108863,134217727,201326591,
 268435455,536870911,805306367,1073741823,
 2147483647,3221225471]