A155371
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Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,1 3,2 3,3 4,1 4,3 polyhexes in any orientation on a planar nXnXn triangular grid.
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%I #3 Mar 31 2012 12:35:23
%S 1,4,13,28,49,110,920,6322,30236,123737,790167,10430919,142197770,
%T 1546938330,16600218633,257429254996,6152180165653
%N Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,1 3,2 3,3 4,1 4,3 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 9 X 9 X 9 example
%e ...........0
%e ..........0.1
%e .........1.1.0
%e ........0.1.1.1
%e .......0.1.0.1.0
%e ......1.0.0.0.0.1
%e .....0.1.1.0.1.1.0
%e ....1.1.1.0.0.1.1.1
%e ...0.1.0.1.0.1.0.1.0
%K nonn
%O 4,2
%A _R. H. Hardin_ Jan 22 2009
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