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A261723 as a simple table

na(n)
14
23
36
45
510
69
718
817
934
1033
1166
1265
13130
14129
15258
16257
17514
18513
191026
201025
212050
222049
234098
244097
258194
268193
2716386
2816385
2932770
3032769
3165538
3265537
33131074
34131073
35262146
36262145
37524290
38524289
391048578
401048577
412097154
422097153
434194306
444194305
458388610
468388609

[4,3,6,5,10,9,18,17,34,33,66,65,130,129,258,257,
 514,513,1026,1025,2050,2049,4098,4097,8194,8193,
 16386,16385,32770,32769,65538,65537,131074,131073,
 262146,262145,524290,524289,1048578,1048577,
 2097154,2097153,4194306,4194305,8388610,8388609]