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A131889 as a simple table

na(n)
01
11
23
33
41
59
627
727
881
981
1027
1127
129
131
1427
15243
16729
176561
1819683
1919683
2059049
2159049
2219683
23177147
24531441
25531441
261594323
271594323
28531441
29531441
30177147
3119683
3259049
3359049
3419683
3519683
366561
37729
38243
3927
401
4181
422187
4319683
44531441
454782969

[1,1,3,3,1,9,27,27,81,81,27,27,9,1,27,243,729,
 6561,19683,19683,59049,59049,19683,177147,531441,
 531441,1594323,1594323,531441,531441,177147,19683,
 59049,59049,19683,19683,6561,729,243,27,1,81,2187,
 19683,531441,4782969]