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A173391 as a simple table

na(n)
19
221
345
4105
5273
6765
72229
86609
919737
1059109
11177213
12531513
131594401
144783053
1514348997
1643046817
17129140265
18387420597
191162261581
203486784521
2110460353329
2231381059741
2394143178965
24282429536625
25847288609593

[9,21,45,105,273,765,2229,6609,19737,59109,177213,
 531513,1594401,4783053,14348997,43046817,
 129140265,387420597,1162261581,3486784521,
 10460353329,31381059741,94143178965,282429536625,
 847288609593]