Array T(n,m)= (n*m)!*Beta(n, m) read by antidiagonals.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =2a(6) =6a(7) =60a(8) =60a(9) =6a(10) =24a(11) =2016a(12) =12096a(13) =2016a(14) =24a(15) =120a(16) =120960a(17) =7983360a(18) =7983360a(19) =120960a(20) =120a(21) =720a(22) =11404800a(23) =12454041600a(24) =149448499200a(25) =12454041600a(26) =11404800a(27) =720a(28) =5040a(29) =1556755200