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A071091
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Number of tilings by lozenges of hexagon with sides 2n, 2n+3, 2n, 2n+3, 2n, 2n+3 and middle triangle in each edge removed.
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0
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OFFSET
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1,2
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REFERENCES
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J. Propp, Enumeration of matchings: problems and progress, pp. 255-291 in L. J. Billera et al., eds, New Perspectives in Algebraic Combinatorics, Cambridge, 1999 (see Problem 2).
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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