A006807 Percolation series for directed hexagonal lattice. (Formerly M2283)

3, 3, 6, 15, 26, 39, 192, 45

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

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.

J. Blease, Series expansions for the directed-bond percolation problem, J. Phys C vol 10 no 7 (1977), 917-924.

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

Crossrefs

Sequence in context: A092370 A245796 A345908 * A298180 A119460 A348539

Adjacent sequences: A006804 A006805 A006806 * A006808 A006809 A006810

Keyword

nonn,more

Author

N. J. A. Sloane.

Status

approved