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A264613 as a simple table

na(n)
12
25
38
411
523
632
747
895
9128
10191
11383
12512
13767
141535
152048
163071
176143
188192
1912287
2024575
2132768
2249151
2398303
24131072
25196607
26393215
27524288
28786431
291572863
302097152
313145727
326291455
338388608

[2,5,8,11,23,32,47,95,128,191,383,512,767,1535,
 2048,3071,6143,8192,12287,24575,32768,49151,98303,
 131072,196607,393215,524288,786431,1572863,
 2097152,3145727,6291455,8388608]