%I #3 Mar 31 2012 12:35:22
%S 1,7,19,70,235,1578,9621,89416,823589,11073433,160764354,3227749885,
%T 73045396627,2178986476482
%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 11 X 11 X 11 example
%e .............0
%e ............0.0
%e ...........1.1.1
%e ..........0.0.0.1
%e .........1.1.1.0.1
%e ........1.0.0.0.0.0
%e .......1.0.0.0.1.1.1
%e ......0.0.0.0.0.0.0.1
%e .....1.0.1.1.1.0.1.0.1
%e ....0.1.0.0.0.1.0.1.0.0
%e ...0.0.1.1.1.0.1.0.1.1.1
%K nonn
%O 4,2
%A _R. H. Hardin_ Jan 22 2009