A155437 - OEIS

A155437

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

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

%S 1,7,19,37,100,428,1830,11336,67788,454698,3575689,35749465,410313440,

%T 5458200826,83668909890

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

%e Maximal 10 X 10 X 10 example

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

%e ...........1.1

%e ..........1.0.1

%e .........0.1.1.0

%e ........0.1.0.0.0

%e .......0.1.0.0.1.0

%e ......0.0.0.0.0.1.0

%e .....1.1.0.0.0.0.1.1

%e ....1.0.1.1.1.0.1.0.1

%e ...0.1.1.0.0.0.0.1.1.0

%K nonn

%O 5,2

%A _R. H. Hardin_ Jan 22 2009