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 A183760 #6 Jan 20 2014 22:21:15 %S A183760 1,1,1,1,2,2,1,2,5,4,1,3,10,18,12,1,3,16,51,71,34,1,4,26,116,271,280, %T A183760 111,1,4,36,233,776,1349,1124,360,1,5,53,421,1908,4749,6487,4415,1226 %N A183760 Unlabeled super-Catalan numbers: patterns of nonintersecting chords joining unlabeled points on a flippable circle, triangle decomposed by number of chords. %C A183760 Decomposition of A183758 by number of chords (pairs of parentheses). Row sums are A183758. See A183758 for description. %C A183760 Triangle is %C A183760 1 %C A183760 1 1 %C A183760 1 2 2 %C A183760 1 2 5 4 %C A183760 1 3 10 18 12 %C A183760 1 3 16 51 71 34 %C A183760 ... %C A183760 Right diagonal is apparently A001895. %Y A183760 Decomposition of A183758. Cf. analogous decomposition of super-Catalan numbers in triangle A033282. %K A183760 nonn,tabl %O A183760 1,5 %A A183760 _David Scambler_, Jan 06 2011