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A062207 as a simple table

na(n)
01
11
27
353
4511
56249
693311
71647085
833554431
9774840977
1019999999999
11570623341221
1217832200896511
13605750213184505
1422224013651116031
15875787780761718749
1636893488147419103231
171654480523772673528353
1878692816150593075150847
193956839311320627178247957

[1,1,7,53,511,6249,93311,1647085,33554431,
 774840977,19999999999,570623341221,17832200896511,
 605750213184505,22224013651116031,
 875787780761718749,36893488147419103231,
 1654480523772673528353,78692816150593075150847,
 3956839311320627178247957]