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A006807 Percolation series for directed hexagonal lattice.
(Formerly M2283)
0
3, 3, 6, 15, 26, 39, 192, 45 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

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.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=0..7.

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

CROSSREFS

Sequence in context: A143418 A092370 A245796 * A298180 A119460 A095356

Adjacent sequences:  A006804 A006805 A006806 * A006808 A006809 A006810

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified January 18 23:05 EST 2019. Contains 319282 sequences. (Running on oeis4.)