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A155347 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0

%I

%S 1,7,19,52,178,691,3685,20423,128624,1025960,9573074,102844369

%N Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,2 5,2 6,3 polyhexes in any orientation on a planar nXnXn triangular grid.

%e Maximal 12 X 12 X 12 example

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

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

%e ............0.0.0

%e ...........1.1.0.0

%e ..........0.0.1.1.0

%e .........0.0.0.0.1.1

%e ........0.0.1.1.0.0.1

%e .......0.1.1.0.0.1.0.0

%e ......1.1.0.0.1.1.0.0.1

%e .....1.0.0.1.1.0.0.1.1.0

%e ....0.0.1.1.0.0.1.1.0.0.0

%e ...0.0.0.0.0.1.1.0.0.0.0.0

%K nonn

%O 6,2

%A _R. H. Hardin_ Jan 22 2009

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Last modified August 22 16:17 EDT 2019. Contains 326178 sequences. (Running on oeis4.)