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A006549 as a simple table

na(n)
11
22
33
44
57
68
716
831
9127
10256
118191
1265536
13131071
14524287
152147483647
162305843009213693951
17618970019642690137449562111
18162259276829213363391578010288127
19170141183460469231731687303715884105727

[1,2,3,4,7,8,16,31,127,256,8191,65536,131071,
 524287,2147483647,2305843009213693951,
 618970019642690137449562111,
 162259276829213363391578010288127,
 170141183460469231731687303715884105727]