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A006521 as a simple table

na(n)
11
23
39
427
581
6171
7243
8513
9729
101539
112187
123249
134617
146561
159747
1613203
1713851
1819683
1929241
2039609
2141553
2259049
2361731
2487723
2597641
26118827
27124659
28177147
29185193
30250857
31263169
32292923
33354537
34356481
35373977
36531441
37555579
38752571

[1,3,9,27,81,171,243,513,729,1539,2187,3249,4617,
 6561,9747,13203,13851,19683,29241,39609,41553,
 59049,61731,87723,97641,118827,124659,177147,
 185193,250857,263169,292923,354537,356481,373977,
 531441,555579,752571]