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A155404
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Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,0 3,1 4,0 4,2 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 1,4,10,22,40,135,446,2376,12035,65714,364923,2734456,23495580,
%T 245925457,2738475904,35447846068,514467522739
%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,0 3,1 4,0 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 9 X 9 X 9 example
%e ...........1
%e ..........1.0
%e .........0.1.1
%e ........1.1.0.0
%e .......1.0.1.0.1
%e ......0.0.0.0.0.1
%e .....1.0.1.0.1.1.0
%e ....0.1.1.0.0.0.1.1
%e ...1.1.0.1.1.0.1.0.1
%K nonn
%O 4,2
%A _R. H. Hardin_ Jan 22 2009
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