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A081026 as a simple table

na(n)
11
22
33
45
56
611
712
823
924
1047
1148
1295
1396
14191
15192
16383
17384
18767
19768
201535
211536
223071
233072
246143
256144
2612287
2712288
2824575
2924576
3049151
3149152
3298303
3398304
34196607
35196608
36393215
37393216
38786431
39786432
401572863
411572864
423145727

[1,2,3,5,6,11,12,23,24,47,48,95,96,191,192,383,
 384,767,768,1535,1536,3071,3072,6143,6144,12287,
 12288,24575,24576,49151,49152,98303,98304,196607,
 196608,393215,393216,786431,786432,1572863,
 1572864,3145727]