a(n) = sqrt(84*A144930(n)^2 - 3).A350967a(n) = sqrt(84*A144930(n)^2 - 3).Terms a(0) =9a(1) =999a(2) =109881a(3) =12085911a(4) =1329340329a(5) =146215350279External referencesoeis: A350967