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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

Table of n, a(n) for n=1..45.

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 October 25 19:28 EDT 2020. Contains 338012 sequences. (Running on oeis4.)