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A155240 Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 3,1 3,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0

%I

%S 1,7,25,55,208,1905,20926,172576,1900996,35023141,893053190,

%T 24012955958,788590457332,36088248750672

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

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

%e Maximal 11 X 11 X 11 example

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

%e ............1.1

%e ...........1.0.1

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

%e .........1.0.0.0.0

%e ........1.0.0.0.1.1

%e .......0.1.1.1.0.0.1

%e ......0.0.0.0.0.0.1.0

%e .....1.1.1.0.1.0.1.0.1

%e ....1.0.0.0.0.1.0.0.0.1

%e ...0.1.0.1.1.1.0.1.1.1.0

%K nonn

%O 3,2

%A _R. H. Hardin_ Jan 22 2009

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Last modified February 8 16:14 EST 2023. Contains 360149 sequences. (Running on oeis4.)