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A308250 as a simple table

na(n)
10
21
349
464
52401
621904
7118336
85764801
91297152256
1022880797696
11149429406721
123114293149696
1333232930569601
142203546857570304
153418922510231809

[0,1,49,64,2401,21904,118336,5764801,1297152256,
 22880797696,149429406721,3114293149696,
 33232930569601,2203546857570304,3418922510231809]