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

Terms

a(0) =1a(1) =1a(2) =0a(3) =2a(4) =2a(5) =1a(6) =6a(7) =12a(8) =12a(9) =8a(10) =24a(11) =72a(12) =108a(13) =108a(14) =81a(15) =120a(16) =480a(17) =960a(18) =1280a(19) =1280a(20) =1024a(21) =720a(22) =3600a(23) =9000a(24) =15000a(25) =18750a(26) =18750a(27) =15625a(28) =5040a(29) =30240