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A055919 Number of directed site animals on a hexagonal lattice with n sites. 1
2, 4, 10, 24, 60, 152, 402, 1094, 3012, 8232, 22086 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..11.

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.

CROSSREFS

Row sums of A055907.

Sequence in context: A100087 A291419 A088354 * A006575 A307900 A230551

Adjacent sequences:  A055916 A055917 A055918 * A055920 A055921 A055922

KEYWORD

nonn,more

AUTHOR

Christian G. Bower, Jun 22 2000

STATUS

approved

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Last modified September 16 02:16 EDT 2019. Contains 327088 sequences. (Running on oeis4.)