A155426 - OEIS

A155426

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

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

%S 1,4,10,22,55,188,612,2433,12227,68641,419235,2949869,24062426,

%T 221080988,2326692356

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

%e Maximal 10 X 10 X 10 example

%e ............1

%e ...........1.0

%e ..........0.1.0

%e .........0.0.1.0

%e ........1.1.1.0.1

%e .......1.0.0.0.0.1

%e ......0.0.0.0.0.1.0

%e .....0.1.1.0.0.1.0.0

%e ....0.1.0.1.0.0.1.1.1

%e ...1.1.0.0.1.1.0.0.0.1

%K nonn

%O 5,2

%A _R. H. Hardin_ Jan 22 2009