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A293047 as a simple table

na(n)
00
10
20
33
44
515
626
763
8120
9255
10502
111023
122036
134095
148178
1516383
1632752
1765535
18131054
19262143
20524268
211048575
222097130
234194303
248388584
2516777215
2633554406
2767108863
28134217700
29268435455
30536870882
311073741823
322147483616
334294967295
348589934558

[0,0,0,3,4,15,26,63,120,255,502,1023,2036,4095,
 8178,16383,32752,65535,131054,262143,524268,
 1048575,2097130,4194303,8388584,16777215,33554406,
 67108863,134217700,268435455,536870882,1073741823,
 2147483616,4294967295,8589934558]