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A006836
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Percolation series for directed hexagonal lattice.
(Formerly M1379)
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1
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1, 0, 0, -1, -2, -5, -10, -20, -41, -86, -182, -393, -853, -1887, -4208, -9445, -21350, -48612, -111307, -255236, -590543, -1362919, -3182137, -7362611, -17377129, -40125851, -96106251, -219681825, -539266908, -1200140540
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OFFSET
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0,5
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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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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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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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