Triangle read by rows: T(n,d) = (n!/d!)*(n+1)*binomial(2n-d+1,n+1)/(n-d+1) (0 <= d <= n).

Terms

a(0) =1a(1) =3a(2) =2a(3) =20a(4) =12a(5) =3a(6) =210a(7) =120a(8) =30a(9) =4a(10) =3024a(11) =1680a(12) =420a(13) =60a(14) =5a(15) =55440a(16) =30240a(17) =7560a(18) =1120a(19) =105a(20) =6a(21) =1235520a(22) =665280a(23) =166320a(24) =25200a(25) =2520a(26) =168a(27) =7a(28) =32432400a(29) =17297280