This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A183759 #10 Jul 25 2021 13:57:20 %S A183759 1,1,1,1,2,3,1,2,7,7,1,3,15,33,22,1,3,24,94,136,66,1,4,41,218,525,552, %T A183759 217,1,4,57,440,1517,2673,2233,715,1,5,86,804,3748,9439,12917,8807, %U A183759 2438 %N A183759 Unlabeled super-Catalan numbers: patterns of nonintersecting chords joining unlabeled points on a circle, triangle decomposed by number of chords. %C A183759 Decomposition of A183757 by number of chords (pairs of parentheses). Row sums are A183757. See A183757 for description. %C A183759 Triangle is %C A183759 1 %C A183759 1 1 %C A183759 1 2 3 %C A183759 1 2 7 7 %C A183759 1 3 15 33 22 %C A183759 1 3 24 94 136 66 %C A183759 ... %C A183759 Right diagonal is apparently A007595. %Y A183759 Decomposition of A183757. %Y A183759 Cf. analogous decomposition of super-Catalan numbers in triangle A033282. %K A183759 nonn,tabl,more %O A183759 1,5 %A A183759 _David Scambler_, Jan 06 2011