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A285646 as a simple table

na(n)
01
11
24
33
416
515
696
763
8384
9255
101536
111023
126144
134095
1424576
1516383
1698304
1765535
18393216
19262143
201572864
211048575
226291456
234194303
2425165824
2516777215
26100663296
2767108863
28402653184
29268435455
301610612736
311073741823
326442450944
334294967295

[1,1,4,3,16,15,96,63,384,255,1536,1023,6144,4095,
 24576,16383,98304,65535,393216,262143,1572864,
 1048575,6291456,4194303,25165824,16777215,
 100663296,67108863,402653184,268435455,1610612736,
 1073741823,6442450944,4294967295]