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A323213 as a simple table

na(n)
15
241
3439
44523
546411
6470303
74751053
847868179
9481346903
104834216447
1148507378197
12486425324491
134875521711327
1448850585043591
15489323461383733
164900321995437591
1749065251868835099
18491200019422325489
194916868348839249987
2049212253916770634411

[5,41,439,4523,46411,470303,4751053,47868179,
 481346903,4834216447,48507378197,486425324491,
 4875521711327,48850585043591,489323461383733,
 4900321995437591,49065251868835099,
 491200019422325489,4916868348839249987,
 49212253916770634411]