Triangle of numbers related to Catalan numbers (A000108).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =3a(7) =4a(8) =3a(9) =1a(10) =9a(11) =11a(12) =8a(13) =4a(14) =1a(15) =28a(16) =33a(17) =24a(18) =13a(19) =5a(20) =1a(21) =90a(22) =104a(23) =76a(24) =43a(25) =19a(26) =6a(27) =1a(28) =297a(29) =339