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A139634 as a simple table

na(n)
11
211
331
471
5151
6311
7631
81271
92551
105111
1110231
1220471
1340951
1481911
15163831
16327671
17655351
181310711
192621431
205242871
2110485751
2220971511
2341943031
2483886071
25167772151
26335544311
27671088631
281342177271
292684354551

[1,11,31,71,151,311,631,1271,2551,5111,10231,
 20471,40951,81911,163831,327671,655351,1310711,
 2621431,5242871,10485751,20971511,41943031,
 83886071,167772151,335544311,671088631,1342177271,
 2684354551]