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 A183760 Unlabeled super-Catalan numbers: patterns of nonintersecting chords joining unlabeled points on a flippable circle, triangle decomposed by number of chords. 1
 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, 111, 1, 4, 36, 233, 776, 1349, 1124, 360, 1, 5, 53, 421, 1908, 4749, 6487, 4415, 1226 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Decomposition of A183758 by number of chords (pairs of parentheses). Row sums are A183758. See A183758 for description. Triangle is 1 1 1 1 2  2 1 2  5  4 1 3 10 18 12 1 3 16 51 71 34 ... Right diagonal is apparently A001895. LINKS CROSSREFS Decomposition of A183758. Cf. analogous decomposition of super-Catalan numbers in triangle A033282. Sequence in context: A215959 A209555 A059594 * A125678 A091562 A106585 Adjacent sequences:  A183757 A183758 A183759 * A183761 A183762 A183763 KEYWORD nonn,tabl AUTHOR David Scambler, Jan 06 2011 STATUS approved

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Last modified September 17 14:07 EDT 2021. Contains 347478 sequences. (Running on oeis4.)