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A064306 as a simple table

na(n)
01
11
27
333
4191
51153
67295
747617
8318463
92170881
1015028223
11105365505
12746651647
135339185153
1438478839807
15279201841153
162037998419967
1714954803494913
18110255315877887
19816299567480833
206066679566041087

[1,1,7,33,191,1153,7295,47617,318463,2170881,
 15028223,105365505,746651647,5339185153,
 38478839807,279201841153,2037998419967,
 14954803494913,110255315877887,816299567480833,
 6066679566041087]