a(1)=5, a(2)=2, a(n) = 5*a(n-1) + 2*a(n-2).

Terms

a(0) =5a(1) =2a(2) =20a(3) =104a(4) =560a(5) =3008a(6) =16160a(7) =86816a(8) =466400a(9) =2505632a(10) =13460960a(11) =72316064a(12) =388502240a(13) =2087143328a(14) =11212721120a(15) =60237892256a(16) =323614903520