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A155321 Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 3,1 3,2 4,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0

%I

%S 1,7,19,37,88,676,4377,23168,128083,1375195,16989531,217989023,

%T 2931139962,55566047699,1303222849730,35399619266821

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

%C Same series for 0,0 1,0 2,1 2,2 3,1 4,2 polyhexes.

%C Same series for 0,0 1,0 1,1 2,0 2,1 3,1 3,2 4,2 polyhexes.

%e Maximal 9 X 9 X 9 example

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

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

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

%e ........0.1.0.1

%e .......0.0.0.1.1

%e ......0.0.0.0.0.0

%e .....1.1.0.0.1.1.1

%e ....0.1.0.1.0.1.0.1

%e ...0.0.1.1.1.0.0.1.1

%K nonn

%O 4,2

%A _R. H. Hardin_ Jan 22 2009

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Last modified September 30 03:02 EDT 2022. Contains 357095 sequences. (Running on oeis4.)