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A139806 as a simple table

na(n)
01
13
27
315
427
555
6111
7223
8443
9887
101775
113551
127099
1314199
1428399
1556799
16113595
17227191
18454383
19908767
201817531
213635063
227270127
2314540255
2429080507
2558161015
26116322031
27232644063
28465288123
29930576247
301861152495
313722304991
327444609979
3314889219959

[1,3,7,15,27,55,111,223,443,887,1775,3551,7099,
 14199,28399,56799,113595,227191,454383,908767,
 1817531,3635063,7270127,14540255,29080507,
 58161015,116322031,232644063,465288123,930576247,
 1861152495,3722304991,7444609979,14889219959]