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A144779 as a simple table

na(n)
15
221
3421
4176821
531265489221
6977530816197201697621
7955566496615167328821993756200407115362021
8913107329453384594090655605142589591944556891901674138343716072975722193082773842421

[5,21,421,176821,31265489221,
 977530816197201697621,
 955566496615167328821993756200407115362021,
 91310732945338459409065560514258959194455689190167\
 4138343716072975722193082773842421]