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A155358
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Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 2,2 3,1 3,2 4,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid.
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0
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%I #3 Mar 31 2012 12:35:23
%S 1,7,19,37,82,439,3622,21277,115970,907157,11150700,162360713,
%T 2286713291,36892603949,784002340205,21639656177753
%N Number of ways to place zero or more nonadjacent 1,0 1,1 2,1 2,2 3,1 3,2 4,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 9 X 9 X 9 example
%e ...........0
%e ..........0.1
%e .........1.1.1
%e ........1.1.1.0
%e .......0.1.0.0.0
%e ......0.0.0.0.1.1
%e .....1.1.0.0.0.1.1
%e ....1.1.1.1.0.1.1.0
%e ...0.0.1.1.0.0.1.1.0
%K nonn
%O 4,2
%A _R. H. Hardin_ Jan 22 2009
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