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

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

%S 1,13,37,73,309,2413,28031,212649,2010251,29604759,633868196,

%T 15160513746,396011442436,13223926465865,597617100526032

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

%e Maximal 11 X 11 X 11 example

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

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

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

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

%e .........0.1.0.1.0

%e ........1.1.1.0.0.0

%e .......1.0.0.0.0.1.1

%e ......0.1.0.1.1.0.0.1

%e .....1.0.0.0.0.1.0.1.0

%e ....1.1.0.1.0.1.0.1.1.0

%e ...0.0.1.1.0.1.1.0.0.0.0

%K nonn

%O 4,2

%A _R. H. Hardin_ Jan 22 2009