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A094008 as a simple table

na(n)
13
27
371
418089
510391023
6781379079653017
72111421691000680031
81430286763442005122380663256416207

[3,7,71,18089,10391023,781379079653017,
 2111421691000680031,
 1430286763442005122380663256416207]