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

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

%S 1,13,37,210,1538,9864,106941,1433656,22817924,508623094,13424571091

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

%e Maximal 11 X 11 X 11 example

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

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

%e ...........0.0.1

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

%e .........1.0.0.0.1

%e ........1.0.0.0.0.0

%e .......1.0.1.0.1.0.1

%e ......1.0.0.1.0.1.0.1

%e .....0.1.0.0.1.0.1.0.1

%e ....0.0.0.1.0.1.0.1.0.1

%e ...1.1.1.1.0.1.0.1.0.1.0

%K nonn

%O 4,2

%A _R. H. Hardin_ Jan 22 2009