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Sizes of clusters in hexagonal lattice A_2 with 3-fold symmetry.
1

%I #6 Mar 30 2012 16:47:49

%S 1,3,6,7,12,13,18,19,21,27,30,31,36,37,42,43,48,54,55,61,63,69,73,75,

%T 78,84,85,90,91,96,97,102,109,114,120,121,123,127,129,135,139,141,144,

%U 150,151,156,163,168,169,174,180

%N Sizes of clusters in hexagonal lattice A_2 with 3-fold symmetry.

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

%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>

%Y Union of A038588 and A038590.

%K nonn

%O 0,2

%A _N. J. A. Sloane_.