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A290074 as a simple table

na(n)
01
11
25
33
423
515
695
763
8383
9255
101535
111023
126143
134095
1424575
1516383
1698303
1765535
18393215
19262143
201572863
211048575
226291455
234194303
2425165823
2516777215
26100663295
2767108863
28402653183
29268435455
301610612735
311073741823
326442450943
334294967295

[1,1,5,3,23,15,95,63,383,255,1535,1023,6143,4095,
 24575,16383,98303,65535,393215,262143,1572863,
 1048575,6291455,4194303,25165823,16777215,
 100663295,67108863,402653183,268435455,1610612735,
 1073741823,6442450943,4294967295]