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A052551 as a simple table

na(n)
01
11
23
33
47
57
615
715
831
931
1063
1163
12127
13127
14255
15255
16511
17511
181023
191023
202047
212047
224095
234095
248191
258191
2616383
2716383
2832767
2932767
3065535
3165535
32131071
33131071
34262143
35262143
36524287
37524287
381048575
391048575
402097151
412097151

[1,1,3,3,7,7,15,15,31,31,63,63,127,127,255,255,
 511,511,1023,1023,2047,2047,4095,4095,8191,8191,
 16383,16383,32767,32767,65535,65535,131071,131071,
 262143,262143,524287,524287,1048575,1048575,
 2097151,2097151]