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A155398 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,1 4,2 5,2 5,3 6,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0

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

%S 1,7,19,37,94,343,1447,8149,47996,306243,2223176,19248076,198155209,

%T 2388609821,33179404593

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

%e Maximal 12 X 12 X 12 example

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

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

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

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

%e ..........1.1.1.1.0

%e .........0.1.0.0.0.0

%e ........0.1.0.0.0.1.0

%e .......0.0.0.0.0.0.1.1

%e ......0.1.0.0.0.0.0.1.0

%e .....1.1.1.0.0.0.0.1.0.0

%e ....0.0.0.1.1.1.0.1.1.0.0

%e ...0.0.0.0.1.0.0.0.0.1.0.0

%K nonn

%O 6,2

%A _R. H. Hardin_ Jan 22 2009

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Last modified April 24 18:17 EDT 2024. Contains 371962 sequences. (Running on oeis4.)