a(n) = a(n-1) - 81*a(n-2), a(0)=1, a(1)=9.

A133672

a(n) = a(n-1) - 81*a(n-2), a(0)=1, a(1)=9.

Terms

    a(0) =1a(1) =9a(2) =-72a(3) =-801a(4) =5031a(5) =69912a(6) =-337599a(7) =-6000471a(8) =21345048a(9) =507383199a(10) =-1221565689a(11) =-42319604808a(12) =56627216001

External references