a(n) = 9*a(n-1) - a(n-2) for n > 0, a(0)=1, a(-1)=1.

A070998

a(n) = 9*a(n-1) - a(n-2) for n > 0, a(0)=1, a(-1)=1.

Terms

    a(0) =1a(1) =8a(2) =71a(3) =631a(4) =5608a(5) =49841a(6) =442961a(7) =3936808a(8) =34988311a(9) =310957991a(10) =2763633608a(11) =24561744481a(12) =218292066721

External references