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A055010 as a simple table

na(n)
00
12
25
311
423
547
695
7191
8383
9767
101535
113071
126143
1312287
1424575
1549151
1698303
17196607
18393215
19786431
201572863
213145727
226291455
2312582911
2425165823
2550331647
26100663295
27201326591
28402653183
29805306367
301610612735
313221225471
326442450943
3312884901887

[0,2,5,11,23,47,95,191,383,767,1535,3071,6143,
 12287,24575,49151,98303,196607,393215,786431,
 1572863,3145727,6291455,12582911,25165823,
 50331647,100663295,201326591,402653183,805306367,
 1610612735,3221225471,6442450943,12884901887]