Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #3 Mar 31 2012 12:35:23
%S 1,4,13,37,146,632,2601,11932,76177,558787,4627682,46978044,543470526
%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,0 4,1 5,0 polyhexes in any orientation on a planar nXnXn triangular grid.
%e Maximal 9 X 9 X 9 example
%e ...........0
%e ..........0.1
%e .........1.0.1
%e ........1.0.1.0
%e .......0.1.0.1.0
%e ......0.1.0.0.1.1
%e .....1.1.0.0.0.0.1
%e ....1.0.0.1.1.1.0.0
%e ...0.0.1.1.0.0.1.1.0
%K nonn
%O 5,2
%A _R. H. Hardin_ Jan 22 2009