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A155405
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Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 3,3 4,1 4,2 5,3 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 1,7,19,37,61,179,1570,9884,43279,162911,1062503,13577598,173995382,
%T 1740580398,16367827293,223104829665,4754997792283,115851743032210
%N Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,2 3,3 4,1 4,2 5,3 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 10 X 10 X 10 example
%e ............0
%e ...........0.1
%e ..........1.1.0
%e .........0.0.1.1
%e ........0.1.1.0.0
%e .......0.0.0.1.0.0
%e ......1.0.1.0.0.1.0
%e .....0.1.1.0.1.1.0.1
%e ....1.1.0.1.0.0.1.1.0
%e ...0.0.1.0.0.0.1.0.1.0
%K nonn
%O 5,2
%A _R. H. Hardin_ Jan 22 2009
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