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A281421 as a simple table

na(n)
01
13
23
315
411
563
643
7255
8171
91023
10683
114095
122731
1316383
1415019
1557343
1619115
17131071
18437931
19254975
20764587
214055039
22314027
231998847
246498987
2519529727
26134131371
27108258303
28528132779
29356507647
302144062123
311535082495
328240704171
334595515391

[1,3,3,15,11,63,43,255,171,1023,683,4095,2731,
 16383,15019,57343,19115,131071,437931,254975,
 764587,4055039,314027,1998847,6498987,19529727,
 134131371,108258303,528132779,356507647,
 2144062123,1535082495,8240704171,4595515391]