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A006781
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Number of polygons of length 4n on Manhattan lattice.
(Formerly M1788)
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2
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1, 2, 7, 32, 168, 970, 5984, 38786, 261160, 1812630, 12895360, 93638634, 691793872, 5186869122, 39388514522, 302457399674, 2345362579172, 18345337742960, 144612959167806, 1147920496989270, 9169516892088470
(list;
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listen;
history;
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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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D. Bennett-Wood, J. L. Cardy, I. Enting, A. J. Guttmann and A. L. Owczarek, On the Non-Universality of a Critical Exponent for Self-Avoiding Walks, arXiv:cond-mat/9805146 [cond-mat.stat-mech], 1998; Nuc. Phys. B, 528, 533--552, 1998. [From Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 13 2010]
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CROSSREFS
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KEYWORD
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nonn,walk,nice
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AUTHOR
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EXTENSIONS
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More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 13 2010
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STATUS
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approved
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