a(n) = 9*a(n-1) - 4*a(n-2), with a(0)=0, a(1)=1.
A190981
a(n) = 9*a(n-1) - 4*a(n-2), with a(0)=0, a(1)=1.
Terms
- a(0) =0a(1) =1a(2) =9a(3) =77a(4) =657a(5) =5605a(6) =47817a(7) =407933a(8) =3480129a(9) =29689429a(10) =253284345a(11) =2160801389a(12) =18434075121a(13) =157263470533
External references
- oeis: A190981