a(n+2) = 9*a(n+1) - a(n), a(0) = 3, a(1) = 27.

A065100

a(n+2) = 9*a(n+1) - a(n), a(0) = 3, a(1) = 27.

Terms

    a(0) =3a(1) =27a(2) =240a(3) =2133a(4) =18957a(5) =168480a(6) =1497363a(7) =13307787a(8) =118272720a(9) =1051146693a(10) =9342047517a(11) =83027280960a(12) =737903481123

External references