a(n) = (4+sqrt(3))*(3+sqrt(3))^n + (4-sqrt(3))*(3-sqrt(3))^n.

A162560

a(n) = (4+sqrt(3))*(3+sqrt(3))^n + (4-sqrt(3))*(3-sqrt(3))^n.

Terms

    a(0) =3a(1) =8a(2) =30a(3) =132a(4) =612a(5) =2880a(6) =13608a(7) =64368a(8) =304560a(9) =1441152a(10) =6819552a(11) =32270400a(12) =152705088a(13) =722608128a(14) =3419418240a(15) =16180860672a(16) =76568654592a(17) =362326763520

External references