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A139521 as a simple table

na(n)
02
12
23
313
4257
515131
683002267
71696274711037607
862384117997457733544603820483
936029882103194027595685829384642730184657157184554323517

[2,2,3,13,257,15131,83002267,1696274711037607,
 62384117997457733544603820483,
 36029882103194027595685829384642730184657157184554\
 323517]