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A126635 as a simple table

na(n)
17
247
3307
41943
511827
669287
7392707
82166743
911703187
1062168327
11325983907
121692105143
138714154547
1444600020967
15227161443907
161152585909143
175830444893907
1829423488811207
19148206112628707
20745396075770743
213744474953809267
2218792450661083047

[7,47,307,1943,11827,69287,392707,2166743,
 11703187,62168327,325983907,1692105143,8714154547,
 44600020967,227161443907,1152585909143,
 5830444893907,29423488811207,148206112628707,
 745396075770743,3744474953809267,
 18792450661083047]