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A080690
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Number of acyclic orientations of n X n grid graph.
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1
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OFFSET
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1,2
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REFERENCES
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N. Calkin, C. Merino, S. Noble and M. Noy Improved Bounds for the Number of Forests and Acyclic Orientations in the Square Lattice, The Electronic Journal of Combinatorics, Volume 10(1), 2003
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LINKS
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Table of n, a(n) for n=1..9.
Peter Tittmann, More Results [Gives a(1)-a(14)]
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CROSSREFS
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Sequence in context: A206753 A015515 A183580 * A079918 A199648 A013719
Adjacent sequences: A080687 A080688 A080689 * A080691 A080692 A080693
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KEYWORD
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nonn
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AUTHOR
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Andre Poenitz [Po"nitz], Peter Tittmann (poenitz(AT)htwm.de), Mar 03 2003
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STATUS
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approved
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