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A155354 Number of ways to place zero or more nonadjacent 2,0 3,1 4,2 4,3 4,4 5,2 6,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0

%I

%S 1,3,7,13,21,54,165,638,2331,9005,38668,204465,1227713,8257094,

%T 59762784,487017754,4487006412,47257428230,557362552428

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

%e Maximal 11 X 11 X 11 example

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

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

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

%e ..........0.0.1.0

%e .........1.1.1.0.0

%e ........0.0.0.1.0.0

%e .......0.0.1.0.1.0.1

%e ......0.0.1.0.0.0.1.0

%e .....1.1.1.0.1.1.1.0.0

%e ....0.0.0.1.0.0.0.1.0.0

%e ...0.0.0.0.1.0.0.0.1.0.0

%K nonn

%O 6,2

%A _R. H. Hardin_ Jan 22 2009

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Last modified January 19 09:16 EST 2022. Contains 350464 sequences. (Running on oeis4.)