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A145508 as a simple table

na(n)
18
278
36238
438925118
51515164889164158
62295724641355838227053650177278
75270351628928392053240255925779522360603268430188068127843838

[8,78,6238,38925118,1515164889164158,
 2295724641355838227053650177278,
 52703516289283920532402559257795223606032684301880\
 68127843838]