A155413
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Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,3 4,3 5,4 5,5 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 1,4,13,28,111,502,1855,7742,47738,322725,2215451,20024605,210636607
%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 2,2 3,3 4,3 5,4 5,5 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 ........1.0.0.1
%e .......0.1.0.1.0
%e ......1.1.0.0.1.1
%e .....1.0.0.0.0.0.0
%e ....0.1.0.1.1.0.1.1
%e ...1.1.0.1.0.1.1.0.1
%K nonn
%O 5,2
%A _R. H. Hardin_ Jan 22 2009
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