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A163399 as a simple table

na(n)
10
21
316
4128
5729
6531441
76561
814348907
967108864
1068719476736
1116777216
1272057594037927936
13268435456
14281474976710656
15281474976710656
164611686018427387904
173814697265625
181818989403545856475830078125

[0,1,16,128,729,531441,6561,14348907,67108864,
 68719476736,16777216,72057594037927936,268435456,
 281474976710656,281474976710656,
 4611686018427387904,3814697265625,
 1818989403545856475830078125]