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A155385
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Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 3,1 4,1 5,2 6,3 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 1,7,19,52,181,571,2900,15410,91393,670564,5234213,49806306,539502855
%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 3,1 4,1 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 12 X 12 X 12 example
%e ..............1
%e .............0.1
%e ............1.0.1
%e ...........1.0.1.1
%e ..........1.0.0.1.0
%e .........1.1.0.1.0.1
%e ........0.1.0.1.0.0.1
%e .......0.0.1.0.0.0.0.1
%e ......1.0.0.1.0.0.0.1.1
%e .....0.1.0.0.0.0.0.0.1.0
%e ....0.0.1.1.0.0.0.0.1.0.0
%e ...0.0.0.1.1.1.1.0.1.0.0.0
%K nonn
%O 6,2
%A _R. H. Hardin_ Jan 22 2009
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