A155344 - OEIS

A155344

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.

%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