A155253 - OEIS

A155253

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

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

%S 1,13,37,73,378,3421,36342,293256,3406317,59935388,1419179921,

%T 37034743264,1162832741191,48524067272860

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

%e Maximal 11 X 11 X 11 example

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

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

%e ...........1.1.1

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

%e .........1.0.0.1.0

%e ........1.1.1.0.0.0

%e .......0.0.1.0.0.0.0

%e ......0.1.0.1.0.0.1.0

%e .....1.1.0.0.0.1.0.1.1

%e ....0.1.0.1.1.1.1.0.1.0

%e ...0.1.1.0.0.1.0.0.1.1.0

%K nonn

%O 4,2

%A _R. H. Hardin_ Jan 22 2009