a(n) = Product_{k=0..n} (n^2 - k).A272179a(n) = Product_{k=0..n} (n^2 - k).Terms a(0) =0a(1) =0a(2) =24a(3) =3024a(4) =524160a(5) =127512000a(6) =42072307200External referencesoeis: A272179