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Search: id:A071091
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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
1
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| 1, 6272, 23763455716, 55031753041200000000, 73940670068249096897010952625900
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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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J. Propp, Updated article
M. Ciucu et al., [math/9912053] Enumeration of lozenge tilings of hexagons with a central triangular hole
J. Propp, Enumeration of matchings: problems and progress, in L. J. Billera et al. (eds.), New Perspectives in Algebraic Combinatorics
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CROSSREFS
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Sequence in context: A031757 A045187 A035904 this_sequence A107582 A054560 A069428
Adjacent sequences: A071088 A071089 A071090 this_sequence A071092 A071093 A071094
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KEYWORD
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nonn
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AUTHOR
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njas, May 28 2002
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