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A162813 as a simple table

na(n)
15
23
315
49
545
627
7135
881
9405
10243
111215
12729
133645
142187
1510935
166561
1732805
1819683
1998415
2059049
21295245
22177147
23885735
24531441
252657205
261594323
277971615
284782969
2923914845
3014348907
3171744535
3243046721
33215233605
34129140163
35645700815
36387420489

[5,3,15,9,45,27,135,81,405,243,1215,729,3645,2187,
 10935,6561,32805,19683,98415,59049,295245,177147,
 885735,531441,2657205,1594323,7971615,4782969,
 23914845,14348907,71744535,43046721,215233605,
 129140163,645700815,387420489]