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A290673 as a simple table

na(n)
01
11
23
33
47
55
615
715
831
917
1063
1153
12127
1373
14255
15207
16511
17263
181023
19883
202047
211185
224095
233309
248191
254181
2616383
2714201
2832767
2919127
3065535
3153243
32131071
3367517
34262143
35226135
36524287
37304125
381048575
39845651
402097151
411066993
424194303
433625471

[1,1,3,3,7,5,15,15,31,17,63,53,127,73,255,207,511,
 263,1023,883,2047,1185,4095,3309,8191,4181,16383,
 14201,32767,19127,65535,53243,131071,67517,262143,
 226135,524287,304125,1048575,845651,2097151,
 1066993,4194303,3625471]