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A308249 as a simple table

na(n)
10
21
316
481
54096
66561
7263169
81478656
940960000
10205549569
1154988374016
12233605955584
136263292059649
14303894740860929
15338531738189824
16170196776412774400
17709858175909625856
1818638643564726714369
19124592287100855910400
202576097707358918017025
21479214351668445504864256

[0,1,16,81,4096,6561,263169,1478656,40960000,
 205549569,54988374016,233605955584,6263292059649,
 303894740860929,338531738189824,
 170196776412774400,709858175909625856,
 18638643564726714369,124592287100855910400,
 2576097707358918017025,479214351668445504864256]