

A006835


Percolation series for directed square lattice.
(Formerly M2742)


1



1, 0, 1, 3, 8, 21, 56, 154, 434, 1252, 3675, 10954, 33044, 100676, 309569, 957424, 2987846, 9330274, 29522921, 92459524, 298142956, 922424269, 3098690837, 9042937179, 34187149573, 79544646085
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OFFSET

0,4


REFERENCES

K. De'Bell and J. W. Essam, Estimates of the site percolation probability exponents for some directed lattices, J. Phys. A 16 (1983), 31453147.
Iwan Jensen and Anthony J. Guttmann, Series Expansions of the Percolation Probability for Directed Square and Honeycomb Lattices, J. Phys. A 28 (1995), 48134833.
R. N. Onody and U. P. C. Neves, Series Expansion of the Directed Percolation Probability, J. Phys. A 25 (1992), 66096615.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


LINKS

I. Jensen, Table of n, a(n) for n = 0..37 (from link below)
I. Jensen, More terms


CROSSREFS

Sequence in context: A243633 A094374 A008909 * A014318 A158495 A273720
Adjacent sequences: A006832 A006833 A006834 * A006836 A006837 A006838


KEYWORD

sign


AUTHOR

N. J. A. Sloane and Simon Plouffe


STATUS

approved



