A155288 - OEIS

A155288

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

%I #3 Mar 31 2012 12:35:22

%S 1,7,25,55,187,1099,9278,75511,645474,7422000,116915443,2299714950,

%T 51760679784,1407030104754

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

%e Maximal 10 X 10 X 10 example

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

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

%e ..........0.1.1

%e .........0.1.0.1

%e ........0.0.0.0.1

%e .......1.1.1.0.0.0

%e ......0.0.0.1.1.0.0

%e .....0.1.0.1.0.0.1.0

%e ....1.1.0.0.0.1.1.0.0

%e ...0.0.1.1.1.0.0.1.1.1

%K nonn

%O 4,2

%A _R. H. Hardin_ Jan 22 2009