Triangle read by rows: T(n,m) = Sum Catalan(n-k)*Catalan(k), k=0..m.

Terms

a(0) =0a(1) =0a(2) =1a(3) =0a(4) =1a(5) =2a(6) =0a(7) =2a(8) =3a(9) =5a(10) =0a(11) =5a(12) =7a(13) =9a(14) =14a(15) =0a(16) =14a(17) =19a(18) =23a(19) =28a(20) =42a(21) =0a(22) =42a(23) =56a(24) =66a(25) =76a(26) =90a(27) =132a(28) =0a(29) =132