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A195531 as a simple table

na(n)
15
217
365
4241
5901
63361
712545
846817
9174725
10652081
112433601
129082321
1333895685
14126500417
15472105985
161761923521
176575588101
1824540428881
1991586127425
20341804080817
211275630195845
224760716702561
2317767236614401
2466308229755041

[5,17,65,241,901,3361,12545,46817,174725,652081,
 2433601,9082321,33895685,126500417,472105985,
 1761923521,6575588101,24540428881,91586127425,
 341804080817,1275630195845,4760716702561,
 17767236614401,66308229755041]