a(n) = Product_{k=0..n} (k^2 + n).A375839a(n) = Product_{k=0..n} (k^2 + n).Terms a(0) =0a(1) =2a(2) =36a(3) =1008a(4) =41600a(5) =2381400a(6) =180457200a(7) =17467670528External referencesoeis: A375839