%I #3 Mar 31 2012 12:35:23
%S 1,7,19,78,382,1679,8329,45625,259832,1747805,14220936
%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,0 4,1 5,1 6,1 7,1 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 10 X 10 X 10 example
%e ............1
%e ...........1.0
%e ..........1.0.0
%e .........1.0.1.0
%e ........0.1.0.1.0
%e .......0.1.0.0.1.0
%e ......0.1.0.0.0.1.1
%e .....0.1.0.0.0.0.0.1
%e ....0.0.0.1.1.1.1.0.1
%e ...1.1.1.1.0.0.0.0.0.1
%K nonn
%O 7,2
%A _R. H. Hardin_ Jan 22 2009