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A191611 as a simple table

na(n)
13
27
38
431
5127
68191
7131071
8524287
92147483647
102305843009213693951
11618970019642690137449562111
12162259276829213363391578010288127
13170141183460469231731687303715884105727

[3,7,8,31,127,8191,131071,524287,2147483647,
 2305843009213693951,618970019642690137449562111,
 162259276829213363391578010288127,
 170141183460469231731687303715884105727]