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A084959 as a simple table

na(n)
12
25
37
47
579
679
7345431
821171649
934640153
104174239239
11268130051191
12268130051191
13253134809926049
14253134809926049
15253134809926049

[2,5,7,7,79,79,345431,21171649,34640153,
 4174239239,268130051191,268130051191,
 253134809926049,253134809926049,253134809926049]