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A006725
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Number of n-celled polygons with perimeter 2n+2 on square lattice.
(Formerly M1623)
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3
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1, 2, 6, 18, 55, 174, 566, 1868, 6237, 21050, 71666, 245696, 847317, 2937116, 10226574, 35746292, 125380257, 441125966, 1556301578, 18155586993
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OFFSET
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1,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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Table of n, a(n) for n=1..20.
I. G. Enting and A. J. Guttmann, On the area of square lattice polygons, J. Statist. Phys., 58 (1990), 475-484.
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CROSSREFS
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Sequence in context: A238236 A294159 A000778 * A066158 A148456 A148457
Adjacent sequences: A006722 A006723 A006724 * A006726 A006727 A006728
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Simon Plouffe
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EXTENSIONS
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Title corrected by David Bevan, Sep 28 2011
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STATUS
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approved
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