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

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

%S 1,7,19,70,235,1578,9621,89416,823589,11073433,160764354,3227749885,

%T 73045396627,2178986476482

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

%e Maximal 11 X 11 X 11 example

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

%e ............0.0

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

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

%e .........1.1.1.0.1

%e ........1.0.0.0.0.0

%e .......1.0.0.0.1.1.1

%e ......0.0.0.0.0.0.0.1

%e .....1.0.1.1.1.0.1.0.1

%e ....0.1.0.0.0.1.0.1.0.0

%e ...0.0.1.1.1.0.1.0.1.1.1

%K nonn

%O 4,2

%A _R. H. Hardin_ Jan 22 2009