a(n) = Product_{i=1..n} (4^i - 3^i).A269576a(n) = Product_{i=1..n} (4^i - 3^i).Terms a(0) =1a(1) =7a(2) =259a(3) =45325a(4) =35398825a(5) =119187843775External referencesoeis: A269576