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A028943 as a simple table

na(n)
11
21
31
41
58
61
727
8125
9343
1064
1112167
1224389
13205379
142146689
1530959144
16274625
173574558889
1850202571769
19553185473329
204302115807744
21578280195945297
221469451780501769
23238670664494938073
2413528653463047586625

[1,1,1,1,8,1,27,125,343,64,12167,24389,205379,
 2146689,30959144,274625,3574558889,50202571769,
 553185473329,4302115807744,578280195945297,
 1469451780501769,238670664494938073,
 13528653463047586625]