Row sums of a triangle based on the Catalan numbers.

Terms

a(0) =1a(1) =2a(2) =5a(3) =14a(4) =43a(5) =142a(6) =497a(7) =1828a(8) =7037a(9) =28326a(10) =119361a(11) =527748a(12) =2454929a(13) =12041410a(14) =62354641a(15) =340840118a(16) =1963757863a(17) =11896370734a(18) =75549183725a(19) =501393978466