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A155368
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Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,1 3,0 3,1 3,2 3,3 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 1,4,10,19,34,55,406,2950,17731,91675,408976,3333241,44182549,
%T 642260617,9294897961,125470980640,2040625065922,47345357523907,
%U 1393444080049042
%N Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,1 3,0 3,1 3,2 3,3 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 10 X 10 X 10 example
%e ............1
%e ...........1.0
%e ..........1.1.1
%e .........1.0.1.1
%e ........0.0.0.0.0
%e .......0.1.1.0.1.0
%e ......1.0.1.1.1.0.1
%e .....0.1.0.0.1.0.1.1
%e ....1.1.1.0.1.0.0.1.0
%e ...1.1.0.1.0.0.1.1.1.1
%K nonn
%O 3,2
%A _R. H. Hardin_ Jan 22 2009
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