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A155254 Number of ways to place zero or more nonadjacent 1,0 2,0 2,1 2,2 3,0 4,0 polyhexes in any orientation on a planar nXnXn triangular grid. 0

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

%S 1,7,25,76,295,1744,13870,129297,1393351,18761115,322004760,

%T 6998296402,187297012609

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

%e Maximal 11 X 11 X 11 example

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

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

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

%e ..........1.1.0.1

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

%e ........1.0.0.0.1.1

%e .......1.1.1.0.1.0.0

%e ......1.0.0.0.0.0.0.1

%e .....1.0.1.0.1.0.1.1.1

%e ....0.0.1.0.0.1.0.0.0.1

%e ...1.1.1.1.0.1.1.1.1.0.1

%K nonn

%O 4,2

%A _R. H. Hardin_ Jan 22 2009

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