%I #3 Mar 31 2012 12:35:22
%S 1,7,25,55,244,1426,10764,97667,1037959,13184770,219939446,4610420436,
%T 119066459836
%N Number of ways to place zero or more nonadjacent 1,1 2,1 2,2 3,1 4,0 4,1 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 10 X 10 X 10 example
%e ............0
%e ...........0.0
%e ..........1.0.0
%e .........1.1.1.1
%e ........0.0.0.0.1
%e .......1.0.1.1.0.0
%e ......0.1.0.1.0.1.0
%e .....0.1.0.1.0.1.1.0
%e ....0.1.0.1.0.0.0.1.0
%e ...0.1.1.0.1.0.0.0.1.1
%K nonn
%O 4,2
%A _R. H. Hardin_ Jan 22 2009