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A055919
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Number of directed site animals on a hexagonal lattice with n sites.
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1
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2, 4, 10, 24, 60, 152, 402, 1094, 3012, 8232, 22086
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| A. J. Guttmann, Indicators of solvability for lattice models, Discrete Math., 217 (2000), 167-189.
A. J. Guttmann and A. R. Conway, Hexagonal lattice directed site animals, Statistical Physics on the Eve of the Twenty-First Century, ed. M. T. Batchelor, World Scientific, 1999.
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CROSSREFS
| Row sums of A055907.
Sequence in context: A052987 A100087 A088354 * A006575 A138175 A121691
Adjacent sequences: A055916 A055917 A055918 * A055920 A055921 A055922
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KEYWORD
| nonn,more
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AUTHOR
| Christian G. Bower (bowerc(AT)usa.net), Jun 22 2000
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