a(n) = 19*a(n-1) - 41*a(n-2) + 19*a(n-3) - a(n-4).
A143699
a(n) = 19*a(n-1) - 41*a(n-2) + 19*a(n-3) - a(n-4).
Terms
- a(0) =0a(1) =1a(2) =19a(3) =319a(4) =5301a(5) =88000a(6) =1460701a(7) =24245719a(8) =402446619a(9) =6680076601a(10) =110880352000
External references
- oeis: A143699