a(1) = 1, a(2) = 5, a(n+2) = 5*a(n+1)+(n+1)*(n+3)*a(n).

A142989

a(1) = 1, a(2) = 5, a(n+2) = 5*a(n+1)+(n+1)*(n+3)*a(n).

Terms

    a(0) =1a(1) =5a(2) =33a(3) =240a(4) =1992a(5) =18360a(6) =187416a(7) =2093760a(8) =25462080a(9) =334592640a(10) =4728412800a(11) =71488811520

External references