A155423
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Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 5,2 6,3 7,3 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 1,7,19,52,172,643,2936,14954,84090,537490,4238593,38671134
%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 5,2 6,3 7,3 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 10 X 10 X 10 example
%e ............0
%e ...........0.0
%e ..........1.0.1
%e .........1.0.0.1
%e ........0.1.0.1.0
%e .......0.1.0.0.1.0
%e ......0.0.1.0.1.0.0
%e .....0.0.1.0.0.1.0.0
%e ....0.0.0.1.0.1.0.0.0
%e ...0.0.0.1.0.0.1.0.0.0
%K nonn
%O 7,2
%A _R. H. Hardin_ Jan 22 2009
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