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A270519 as a simple table

na(n)
13
27
318
4217
521586
6132830816
78232750479147118
88738244742575919521189548340591
928575128242342620144630216663972970082807062570299713849045286

[3,7,18,217,21586,132830816,8232750479147118,
 8738244742575919521189548340591,
 28575128242342620144630216663972970082807062570299\
 713849045286]