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Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,0 3,1 4,1 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.
0

%I #3 Mar 31 2012 12:35:23

%S 1,7,19,52,254,1061,4586,28708,218507,1736540,17357415,205447067,

%T 2686619638

%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,0 3,1 4,1 5,1 polyhexes in any orientation on a planar nXnXn triangular grid.

%e Maximal 9 X 9 X 9 example

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

%e ..........0.1

%e .........1.1.0

%e ........1.1.0.1

%e .......1.1.0.0.1

%e ......1.0.0.0.1.1

%e .....0.0.0.0.0.1.1

%e ....1.1.1.1.0.0.1.0

%e ...0.0.1.1.1.1.0.1.0

%K nonn

%O 5,2

%A _R. H. Hardin_ Jan 22 2009