%I #3 Mar 31 2012 12:35:22
%S 1,13,37,181,1229,8379,80551,1100805,17145265,351104244,9283888557,
%T 306284314214
%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 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 ...........0.1.1
%e ..........1.0.0.1
%e .........0.1.1.0.1
%e ........0.0.0.1.0.0
%e .......1.0.1.0.1.0.0
%e ......1.0.1.0.0.0.1.1
%e .....1.0.1.0.1.1.1.0.0
%e ....0.1.0.1.0.0.0.0.1.1
%e ...0.1.0.1.0.0.1.1.1.0.0
%K nonn
%O 4,2
%A _R. H. Hardin_ Jan 22 2009
|