Triangle read by rows: T(n,k) = n!*k!, 0 <= k <= n.

Terms

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