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

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

%S 1,13,37,73,258,1871,22758,161452,1241904,16300245,324762872,

%T 7210518148,157052254320,4356147792581

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

%e Maximal 11 X 11 X 11 example

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

%e ............1.1

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

%e ..........0.0.0.1

%e .........1.1.0.1.0

%e ........1.0.0.0.0.1

%e .......1.0.0.1.0.0.1

%e ......0.1.1.0.1.1.1.0

%e .....1.0.0.0.0.0.0.0.1

%e ....1.0.0.1.0.0.1.0.0.1

%e ...0.1.1.1.0.0.0.1.1.1.0

%K nonn

%O 4,2

%A _R. H. Hardin_ Jan 22 2009