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A066021 as a simple table

na(n)
13
27
327
464
5125
6119
7343
8177
9729
101000
111331
121728
132197
142744
153375
164096
174913
185832
196859
208000
219261
2210648
2312167
2413824
2515625
2617576
2719683
2821952
2924389
3027000
3129791
3232768
3335937
3439304
3542875
3646656
3750653
3854872
3959319
4064000

[3,7,27,64,125,119,343,177,729,1000,1331,1728,
 2197,2744,3375,4096,4913,5832,6859,8000,9261,
 10648,12167,13824,15625,17576,19683,21952,24389,
 27000,29791,32768,35937,39304,42875,46656,50653,
 54872,59319,64000]