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Search: id:A006781
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| A006781 |
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Number of polygons of length 4n on Manhattan lattice.
(Formerly M1788)
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+0
1
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| 1, 2, 7, 32, 168, 970, 5984, 38786, 261160, 1812630, 12895360, 93638634
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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I. G. Enting and A. J. Guttmann, Self-avoiding polygons on the square, L and Manhattan lattices, J. Phys. A 18 (1985), 1007-1017.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
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Sequence in context: A015655 A047850 A108524 this_sequence A115197 A107593 A125277
Adjacent sequences: A006778 A006779 A006780 this_sequence A006782 A006783 A006784
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KEYWORD
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nonn,walk,nice,more
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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