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A066431 as a simple table

na(n)
10
281
3729
46561
559049
6531441
74782969
843046721
90
10486784401
11727739626
123801397473
137390478182
145013665073
1526942641524
1668218142337
1750040016962
18127461340881
1920157955560
20179056928801
2195734214766
22798384194161
23812529625653
24123794634177
251880664942124

[0,81,729,6561,59049,531441,4782969,43046721,0,
 486784401,727739626,3801397473,7390478182,
 5013665073,26942641524,68218142337,50040016962,
 127461340881,20157955560,179056928801,95734214766,
 798384194161,812529625653,123794634177,
 1880664942124]