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%I #3 Mar 31 2012 12:35:22
%S 1,7,19,52,260,1220,7357,60311,545790,5982967,83324072,1383688085,
%T 28070423509,700749741616
%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,1 4,1 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 11 X 11 X 11 example
%e .............0
%e ............0.1
%e ...........0.0.1
%e ..........1.0.1.1
%e .........1.0.0.1.0
%e ........1.1.0.0.1.0
%e .......0.1.0.0.0.0.0
%e ......0.1.0.0.1.1.1.0
%e .....0.0.0.1.1.1.0.0.0
%e ....1.1.1.0.0.0.0.1.1.1
%e ...0.0.1.1.1.0.1.1.1.0.0
%K nonn
%O 4,2
%A _R. H. Hardin_ Jan 22 2009
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