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A006818
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Trails of length n on hexagonal lattice.
(Formerly M4203)
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0
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1, 6, 30, 150, 738, 3570, 17118, 81498, 385710, 1817046, 8528478, 39903462, 186198642, 866861394, 4027766490, 18681900270, 86518735722
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OFFSET
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0,2
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COMMENTS
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The hexagonal lattice is the familiar 2-dimensional lattice in which each point has 6 neighbors. This is sometimes called the triangular lattice.
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REFERENCES
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A. J. Guttmann, Lattice trails II: numerical results, J. Phys. A 22 (1989), 575-588.
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=0..16.
G. Nebe and N. J. A. Sloane, Home page for hexagonal (or triangular) lattice A2
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CROSSREFS
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Sequence in context: A075886 A001412 A162937 * A006819 A163317 A163922
Adjacent sequences: A006815 A006816 A006817 * A006819 A006820 A006821
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KEYWORD
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nonn,walk
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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