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A121245 as a simple table

na(n)
13
236
3729
420736
5759375
634012224
71801088541
8152587890625
910578455953408
10819628286980801
1170188843638032384
126582952005840035281
13671088640000000000000
1473885357344138503765449

[3,36,729,20736,759375,34012224,1801088541,
 152587890625,10578455953408,819628286980801,
 70188843638032384,6582952005840035281,
 671088640000000000000,73885357344138503765449]