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A239491 as a simple table

na(n)
14
227
3256
41728
53125
611664
778732
8200000
9531441
10823543
111350000
129112500
1352706752
1461509375
15156250000

[4,27,256,1728,3125,11664,78732,200000,531441,
 823543,1350000,9112500,52706752,61509375,
 156250000]