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

Terms

a(0) =1a(1) =0a(2) =2a(3) =0a(4) =6a(5) =12a(6) =0a(7) =24a(8) =120a(9) =120a(10) =0a(11) =120a(12) =1080a(13) =2520a(14) =1680a(15) =0a(16) =720a(17) =10080a(18) =40320a(19) =60480a(20) =30240a(21) =0a(22) =5040a(23) =100800a(24) =604800a(25) =1512000a(26) =1663200a(27) =665280a(28) =0a(29) =40320