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A155355 Number of ways to place zero or more nonadjacent 1,1 2,1 2,2 3,0 3,1 3,2 3,3 4,1 polyhexes in any orientation on a planar nXnXn triangular grid. 0

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

%S 1,4,13,28,49,171,1310,8460,42491,242978,2107793,27648766,373047925,

%T 4984501036,77677934468,1580716536075,41780194476260

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

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

%e Maximal 9 X 9 X 9 example

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

%e ..........1.0

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

%e ........1.1.1.1

%e .......0.0.0.1.0

%e ......1.1.0.0.0.1

%e .....0.1.0.0.0.1.1

%e ....0.1.1.0.1.1.1.1

%e ...0.1.1.1.0.1.0.0.0

%K nonn

%O 4,2

%A _R. H. Hardin_ Jan 22 2009

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Last modified August 29 18:31 EDT 2024. Contains 375518 sequences. (Running on oeis4.)