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A290418 as a simple table

na(n)
01
11
23
33
47
55
615
715
831
923
1063
1159
12127
1385
14255
15255
16511
17383
181023
19959
202047
211375
224095
234079
248191
256103
2616383
2715291
2832767
2921845
3065535
3165535
32131071
3398303
34262143
35245759
36524287
37352255
381048575
391044479
402097151
411562623
424194303

[1,1,3,3,7,5,15,15,31,23,63,59,127,85,255,255,511,
 383,1023,959,2047,1375,4095,4079,8191,6103,16383,
 15291,32767,21845,65535,65535,131071,98303,262143,
 245759,524287,352255,1048575,1044479,2097151,
 1562623,4194303]