a(n) = (n + 1)^2*a(n - 2) + a(n - 1), starting 0, 9, ....
A335026
a(n) = (n + 1)^2*a(n - 2) + a(n - 1), starting 0, 9, ....
Terms
- a(0) =0a(1) =9a(2) =9a(3) =234a(4) =558a(5) =12024a(6) =47736a(7) =1021680a(8) =5795280a(9) =129418560a(10) =963938880a(11) =22835675520a(12) =211767696000
External references
- oeis: A335026