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A161749 as a simple table

na(n)
13
25
3127
43299
51967249047
68191
730450469261
8131071
9524287
10476562280296181
1170358283824461

[3,5,127,3299,1967249047,8191,30450469261,131071,
 524287,476562280296181,70358283824461]