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A157968 as a simple table

na(n)
00
11
215
363
4127
5255
6511
71023
84095
916383
1032767
1165535
12262143
131048575
142097151
154194303
1616777215
1733554431
1867108863
19134217727
20268435455
211073741823
224294967295

[0,1,15,63,127,255,511,1023,4095,16383,32767,
 65535,262143,1048575,2097151,4194303,16777215,
 33554431,67108863,134217727,268435455,1073741823,
 4294967295]