A triangle related to A000108 (Catalan) and A000302 (powers of 4).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =1a(6) =5a(7) =22a(8) =9a(9) =1a(10) =14a(11) =93a(12) =58a(13) =13a(14) =1a(15) =42a(16) =386a(17) =325a(18) =110a(19) =17a(20) =1a(21) =132a(22) =1586a(23) =1686a(24) =765a(25) =178a(26) =21a(27) =1a(28) =429a(29) =6476