a(n) = 18*a(n-1) + a(n-2), starting with a(0) = 2 and a(1) = 18.
A090307
a(n) = 18*a(n-1) + a(n-2), starting with a(0) = 2 and a(1) = 18.
Terms
- a(0) =2a(1) =18a(2) =326a(3) =5886a(4) =106274a(5) =1918818a(6) =34644998a(7) =625528782a(8) =11294163074a(9) =203920464114
External references
- oeis: A090307