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A006813 Percolation series for directed hexagonal lattice.
(Formerly M2778)
+0
1
3, 9, 21, 48, 105, 219, 459, 936 (list; graph; listen)
OFFSET

1,1

COMMENT

The hexagonal lattice is the familiar 2-dimensional lattice in which each point has 6 neighbors. This is sometimes called the triangular lattice.

REFERENCES

J. Blease, Series expansions for the directed-bond percolation problem, J. Phys. C 10 (1977), 917-924.

LINKS

G. Nebe and N. J. A. Sloane, Home page for hexagonal (or triangular) lattice A2

CROSSREFS

Sequence in context: A014286 A000714 A090984 this_sequence A056823 A105544 A119917

Adjacent sequences: A006810 A006811 A006812 this_sequence A006814 A006815 A006816

KEYWORD

nonn

AUTHOR

njas

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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