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

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =2a(6) =0a(7) =3a(8) =12a(9) =6a(10) =0a(11) =4a(12) =36a(13) =72a(14) =24a(15) =0a(16) =5a(17) =80a(18) =360a(19) =480a(20) =120a(21) =0a(22) =6a(23) =150a(24) =1200a(25) =3600a(26) =3600a(27) =720a(28) =0a(29) =7