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A028939 as a simple table

na(n)
11
21
31
4125
564
624389
72146689
8274625
950202571769
104302115807744
111469451780501769
1213528653463047586625
13343216282443844010111
1463061816101171948456692661
15495133617181351428873673516736

[1,1,1,125,64,24389,2146689,274625,50202571769,
 4302115807744,1469451780501769,
 13528653463047586625,343216282443844010111,
 63061816101171948456692661,
 495133617181351428873673516736]