Triangle T(n,k) of associated Lah numbers, n>=2, k=1..floor(n/2).

Terms

a(0) =2a(1) =6a(2) =24a(3) =12a(4) =120a(5) =120a(6) =720a(7) =1080a(8) =120a(9) =5040a(10) =10080a(11) =2520a(12) =40320a(13) =100800a(14) =40320a(15) =1680a(16) =362880a(17) =1088640a(18) =604800a(19) =60480a(20) =3628800a(21) =12700800a(22) =9072000a(23) =1512000a(24) =30240a(25) =39916800a(26) =159667200a(27) =139708800a(28) =33264000a(29) =1663200