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A155594 as a simple table

na(n)
01
111
2103
31007
410015
5100031
61000063
710000127
8100000255
91000000511
1010000001023
11100000002047
121000000004095
1310000000008191
14100000000016383
151000000000032767
1610000000000065535
17100000000000131071

[1,11,103,1007,10015,100031,1000063,10000127,
 100000255,1000000511,10000001023,100000002047,
 1000000004095,10000000008191,100000000016383,
 1000000000032767,10000000000065535,
 100000000000131071]