A155328 - OEIS

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

%S 1,4,13,45,200,827,3807,19771,133675,1067815,10084717,113366836,

%T 1442256377

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

%e Maximal 8 X 8 X 8 example

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

%e .........0.1

%e ........1.0.1

%e .......1.0.1.1

%e ......1.0.0.0.1

%e .....1.1.0.0.0.1

%e ....1.0.0.0.1.0.0

%e ...1.0.1.1.1.1.1.1

%K nonn

%O 5,2

%A _R. H. Hardin_ Jan 22 2009