a(n) = 21a(n-1) - a(n-2), starting with a(0) = 2 and a(1) = 21.
A090729
a(n) = 21a(n-1) - a(n-2), starting with a(0) = 2 and a(1) = 21.
Terms
- a(0) =2a(1) =21a(2) =439a(3) =9198a(4) =192719a(5) =4037901a(6) =84603202a(7) =1772629341a(8) =37140612959a(9) =778180242798
External references
- oeis: A090729