A155403 - OEIS

A155403

Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,2 5,3 6,3 7,3 polyhexes in any orientation on a planar nXnXn triangular grid.

%I #3 Mar 31 2012 12:35:23

%S 1,7,19,43,130,472,2062,9990,51107,296798,2149983,17713635

%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 4,2 5,3 6,3 7,3 polyhexes in any orientation on a planar nXnXn triangular grid.

%e Maximal 10 X 10 X 10 example

%e ............0

%e ...........0.0

%e ..........0.0.0

%e .........1.0.0.0

%e ........0.1.0.0.0

%e .......1.0.1.1.1.1

%e ......0.1.0.0.0.0.1

%e .....0.0.1.1.1.1.0.1

%e ....0.0.0.0.0.0.1.0.0

%e ...0.0.0.0.0.0.0.1.0.0

%K nonn

%O 7,2

%A _R. H. Hardin_ Jan 22 2009