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A077896 as a simple table

na(n)
01
10
23
30
47
50
615
70
831
90
1063
110
12127
130
14255
150
16511
170
181023
190
202047
210
224095
230
248191
250
2616383
270
2832767
290
3065535
310
32131071
330
34262143
350
36524287
370
381048575
390
402097151
410
424194303
430
448388607
450
4616777215
470
4833554431
490
5067108863
510
52134217727
530
54268435455

[1,0,3,0,7,0,15,0,31,0,63,0,127,0,255,0,511,0,
 1023,0,2047,0,4095,0,8191,0,16383,0,32767,0,65535,
 0,131071,0,262143,0,524287,0,1048575,0,2097151,0,
 4194303,0,8388607,0,16777215,0,33554431,0,
 67108863,0,134217727,0,268435455]