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A137664 as a simple table

na(n)
18
263
37775
42097151
5743008370687
6793714773254143
72185911559738696531967
85242879999999999999999999
955572324035428505185378394701823
106863037736488299999999999999999999999999999

[8,63,7775,2097151,743008370687,793714773254143,
 2185911559738696531967,5242879999999999999999999,
 55572324035428505185378394701823,
 6863037736488299999999999999999999999999999]