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A121858 as a simple table

na(n)
13
29
381
4729
559049
6531441
743046721
8387420489
931381059609
1022876792454961
11205891132094649
12150094635296999121
1312157665459056928801
14109418989131512359209
158862938119652501095929
166461081889226673298932241

[3,9,81,729,59049,531441,43046721,387420489,
 31381059609,22876792454961,205891132094649,
 150094635296999121,12157665459056928801,
 109418989131512359209,8862938119652501095929,
 6461081889226673298932241]