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A006271 as a simple table

na(n)
02
15
2197
37761797
4467613464999866416197
5102249460387306384473056172738577521087843948916391508591105797

[2,5,197,7761797,467613464999866416197,
 10224946038730638447305617273857752108784394891639\
 1508591105797]