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A006861 Number of directed site animals on hexagonal lattice.
(Formerly M0786)

%I M0786

%S 1,2,3,6,11,21,40,77,149,289,563,1099,2152,4222,8299,16339,32217,

%T 63612,125753,248870,493015,977576,1940042,3853117,7658211,15231219,

%U 30312012,60360046,120260317

%N Number of directed site animals on hexagonal lattice.

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

%D D. Dhar et al., Enumeration of directed site animals on two-dimensional lattices, J. Phys. A 15 (1982), L279-L284.

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

%H G. Nebe and N. J. A. Sloane, <a href="http://www.math.rwth-aachen.de/~Gabriele.Nebe/LATTICES/A2.html">Home page for hexagonal (or triangular) lattice A2</a>

%K nonn

%O 1,2

%A _Simon Plouffe_ and _N. J. A. Sloane_.

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Last modified February 20 08:41 EST 2019. Contains 320325 sequences. (Running on oeis4.)