Irregular triangle of Catalan-based numbers, read by rows.

Terms

a(0) =1a(1) =1a(2) =2a(3) =-2a(4) =5a(5) =-14a(6) =5a(7) =14a(8) =-74a(9) =74a(10) =-14a(11) =42a(12) =-352a(13) =668a(14) =-352a(15) =42a(16) =132a(17) =-1588a(18) =4808a(19) =-4808a(20) =1588a(21) =-132a(22) =429a(23) =-6946a(24) =30371a(25) =-48540a(26) =30371a(27) =-6946a(28) =429a(29) =1430