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A065780 as a simple table

na(n)
15
215
335
4285
54035
62660285
740530004035
8478354453999997339715
931246194523464509984000000000040530004035
108209490213224904365731763888026434805200000000000000000000478354453999997339715

[5,15,35,285,4035,2660285,40530004035,
 478354453999997339715,
 31246194523464509984000000000040530004035,
 82094902132249043657317638880264348052000000000000\
 00000000478354453999997339715]