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A155371 Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 3,1 3,2 3,3 4,1 4,3 polyhexes in any orientation on a planar nXnXn triangular grid. 0

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

%S 1,4,13,28,49,110,920,6322,30236,123737,790167,10430919,142197770,

%T 1546938330,16600218633,257429254996,6152180165653

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

%e Maximal 9 X 9 X 9 example

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

%e ..........0.1

%e .........1.1.0

%e ........0.1.1.1

%e .......0.1.0.1.0

%e ......1.0.0.0.0.1

%e .....0.1.1.0.1.1.0

%e ....1.1.1.0.0.1.1.1

%e ...0.1.0.1.0.1.0.1.0

%K nonn

%O 4,2

%A _R. H. Hardin_ Jan 22 2009

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Last modified March 29 05:28 EDT 2024. Contains 371264 sequences. (Running on oeis4.)