A Catalan triangle by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =8a(8) =4a(9) =1a(10) =1a(11) =20a(12) =15a(13) =5a(14) =1a(15) =1a(16) =50a(17) =53a(18) =21a(19) =6a(20) =1a(21) =1a(22) =126a(23) =182a(24) =84a(25) =28a(26) =7a(27) =1a(28) =1a(29) =322