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A237286 as a simple table

na(n)
16
225
328
4496
5652
68128
710682
810828
933550336
1044655764
118589869056
128623554304
13137438691328

[6,25,28,496,652,8128,10682,10828,33550336,
 44655764,8589869056,8623554304,137438691328]