a(n) = Product_{k=1..n-4} (n-k-2)!^(k*k!).A224986a(n) = Product_{k=1..n-4} (n-k-2)!^(k*k!).Terms a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =96a(6) =8153726976External referencesoeis: A224986