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A154117 as a simple table

na(n)
01
12
27
317
437
577
6157
7317
8637
91277
102557
115117
1210237
1320477
1440957
1581917
16163837
17327677
18655357
191310717
202621437
215242877
2210485757
2320971517
2441943037
2583886077
26167772157
27335544317
28671088637
291342177277
302684354557

[1,2,7,17,37,77,157,317,637,1277,2557,5117,10237,
 20477,40957,81917,163837,327677,655357,1310717,
 2621437,5242877,10485757,20971517,41943037,
 83886077,167772157,335544317,671088637,1342177277,
 2684354557]