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A256330
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Number of H&S Family matchings on n edges.
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2
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OFFSET
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1,2
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COMMENTS
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The H&S Family of matchings is the family of matchings that can be drawn in the plane without crossings.
Jay Pantone has computed the first 1500 terms and has a conjectured g.f. - N. J. A. Sloane, Oct 06 2016
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LINKS
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EXAMPLE
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a(5)= 592; in canonical sequence form the two 3-noncrossing matchings it does not include are 1231435425 and 1234254153.
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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