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A263566 as a simple table

na(n)
116
2256
31296
428561
5331776
64100625
749787136
8655360000
98100000000
10101904600625
111281641353216
1216160601000625
13202865213941776
142552640623984896
1532107262791520016
16403852218590929761

[16,256,1296,28561,331776,4100625,49787136,
 655360000,8100000000,101904600625,1281641353216,
 16160601000625,202865213941776,2552640623984896,
 32107262791520016,403852218590929761]