a(n) = 2^(2*n+1) + 3^(2*n+1).

Terms

a(0) =5a(1) =35a(2) =275a(3) =2315a(4) =20195a(5) =179195a(6) =1602515a(7) =14381675a(8) =129271235a(9) =1162785755a(10) =10462450355a(11) =94151567435a(12) =847322163875