a(1) = 1, a(2) = 9, a(n+2) = 9*a(n+1)+(n+1)*(n+3)*a(n).
A142991
a(1) = 1, a(2) = 9, a(n+2) = 9*a(n+1)+(n+1)*(n+3)*a(n).
Terms
- a(0) =1a(1) =9a(2) =89a(3) =936a(4) =10560a(5) =127800a(6) =1657080a(7) =22965120a(8) =339252480a(9) =5326819200a(10) =88651670400
External references
- oeis: A142991