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%I #3 Mar 31 2012 12:35:22
%S 1,7,25,105,639,3603,22857,241966,2928219,43585143,850752020,
%T 19021431704,530984535190
%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,0 4,0 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 11 X 11 X 11 example
%e .............1
%e ............1.0
%e ...........1.1.0
%e ..........1.0.0.0
%e .........1.0.1.0.0
%e ........0.0.0.1.1.0
%e .......1.0.0.0.1.0.1
%e ......1.0.0.0.0.1.0.1
%e .....1.0.0.0.0.0.1.0.1
%e ....1.1.0.0.0.1.0.0.1.1
%e ...1.0.0.1.1.1.1.1.0.0.1
%K nonn
%O 4,2
%A _R. H. Hardin_ Jan 22 2009
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