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A134459 as a simple table

na(n)
12
23
34
47
58
616
731
8127
9256
108191
1165536
12131071
13524287
142147483647
152305843009213693951
16618970019642690137449562111
17162259276829213363391578010288127
18170141183460469231731687303715884105727

[2,3,4,7,8,16,31,127,256,8191,65536,131071,524287,
 2147483647,2305843009213693951,
 618970019642690137449562111,
 162259276829213363391578010288127,
 170141183460469231731687303715884105727]