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A248381 as a simple table

na(n)
19
215
327
457
581
6177
7243
8393
9579
10729
11849
121257
132187
144197
154143
165853
176561
1817817
1917781
2019683
2156157
2259049
23104289
24104277
25154509

[9,15,27,57,81,177,243,393,579,729,849,1257,2187,
 4197,4143,5853,6561,17817,17781,19683,56157,59049,
 104289,104277,154509]