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A056781 as a simple table

na(n)
12
23
34
45
57
68
79
811
913
1016
1125
1227
1332
1449
1564
1681
17125
18128
19243
20256
21512
22625
23729
241024
252048
262187
274096
286561
298192
3016384
3132768
3265536

[2,3,4,5,7,8,9,11,13,16,25,27,32,49,64,81,125,128,
 243,256,512,625,729,1024,2048,2187,4096,6561,8192,
 16384,32768,65536]