Integers that are the product of two factorials A000142.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =12a(5) =24a(6) =36a(7) =48a(8) =120a(9) =144a(10) =240a(11) =576a(12) =720a(13) =1440a(14) =2880a(15) =4320a(16) =5040a(17) =10080a(18) =14400a(19) =17280a(20) =30240a(21) =40320a(22) =80640a(23) =86400a(24) =120960a(25) =241920a(26) =362880a(27) =518400a(28) =604800a(29) =725760