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A155438
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Number of ways to place zero or more nonadjacent 2,1 2,2 3,1 4,0 4,1 5,2 6,3 6,4 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 1,7,19,37,73,192,799,5700,31065,143784,760292,5454945,52282160,
%T 593679020,6642535818,77363263396
%N Number of ways to place zero or more nonadjacent 2,1 2,2 3,1 4,0 4,1 5,2 6,3 6,4 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 11 X 11 X 11 example
%e .............0
%e ............0.0
%e ...........1.0.0
%e ..........0.1.1.1
%e .........0.1.0.0.1
%e ........0.1.0.0.0.0
%e .......1.0.1.0.1.1.0
%e ......1.0.0.0.0.0.1.0
%e .....0.1.0.0.1.0.0.1.1
%e ....0.0.1.1.1.0.0.1.0.0
%e ...0.0.1.0.0.0.1.1.0.0.0
%K nonn
%O 6,2
%A _R. H. Hardin_ Jan 22 2009
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