A155283 - OEIS

A155283

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

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

%S 1,13,37,190,798,5458,43604,402857,5033744,71523854,1310467409,

%T 28108624809

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

%e Maximal 12 X 12 X 12 example

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

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

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

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

%e ..........0.0.1.0.1

%e .........0.0.0.1.0.1

%e ........1.1.1.0.0.1.0

%e .......1.0.0.0.0.1.0.0

%e ......1.0.1.0.0.0.0.0.0

%e .....1.0.1.0.1.0.1.1.1.1

%e ....0.0.1.0.0.1.0.0.0.0.1

%e ...1.1.1.0.0.0.1.1.1.1.0.1

%K nonn

%O 5,2

%A _R. H. Hardin_ Jan 22 2009