Triangle read by rows: T(n,k) = (n-1)!*n^(k-1)*binomial(n,k)/(k-1)!.

Terms

a(0) =1a(1) =2a(2) =2a(3) =6a(4) =18a(5) =9a(6) =24a(7) =144a(8) =192a(9) =64a(10) =120a(11) =1200a(12) =3000a(13) =2500a(14) =625a(15) =720a(16) =10800a(17) =43200a(18) =64800a(19) =38880a(20) =7776a(21) =5040a(22) =105840a(23) =617400a(24) =1440600a(25) =1512630a(26) =705894a(27) =117649