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A271139 as a simple table

na(n)
10
21
356
44890
5778256
6245558565
7158940847866
8214449879142050
9608705034569823114
103658579907427743991339

[0,1,56,4890,778256,245558565,158940847866,
 214449879142050,608705034569823114,
 3658579907427743991339]