a(n) = 21*a(n-1) + a(n-2), starting with a(0) = 2 and a(1) = 21.
A090310
a(n) = 21*a(n-1) + a(n-2), starting with a(0) = 2 and a(1) = 21.
Terms
- a(0) =2a(1) =21a(2) =443a(3) =9324a(4) =196247a(5) =4130511a(6) =86936978a(7) =1829807049a(8) =38512885007a(9) =810600392196
External references
- oeis: A090310