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A126627 as a simple table

na(n)
17
249
3343
42401
516807
6116929
7803383
85432161
936120007
10236404609
111525601623
129726181921
1361371928807
14383929313089
152384606035063
1614723095123681
1790457525939207
18553507860826369
193375536272503703
2020528377102849441
21124556950506727207

[7,49,343,2401,16807,116929,803383,5432161,
 36120007,236404609,1525601623,9726181921,
 61371928807,383929313089,2384606035063,
 14723095123681,90457525939207,553507860826369,
 3375536272503703,20528377102849441,
 124556950506727207]