a(n) = Product_{k=0..n} (n^2 + k).A272180a(n) = Product_{k=0..n} (n^2 + k).Terms a(0) =0a(1) =2a(2) =120a(3) =11880a(4) =1860480a(5) =427518000a(6) =135970773120External referencesoeis: A272180