Triangle T(n,k) = M(2n,k,-1), with 0 <= k <= n, n >= 0, and array M is defined in A050144.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =4a(5) =5a(6) =1a(7) =6a(8) =14a(9) =14a(10) =1a(11) =8a(12) =27a(13) =48a(14) =42a(15) =1a(16) =10a(17) =44a(18) =110a(19) =165a(20) =132a(21) =1a(22) =12a(23) =65a(24) =208a(25) =429a(26) =572a(27) =429a(28) =1a(29) =14