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 A154037 Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 3 X 3 X 3 subtriangle summing to 4. 0

%I

%S 0,14,8,0,29,0,0,33,0,0,27,0,0,27,0,0,27,0,0,27,0,0,27,0,0,27,0,0,27,

%T 0,0,27,0,0,27,0,0,27,0,0,27,0,0,27,0,0,27,0,0,27,0,0,27,0,0,27,0,0

%N Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 3 X 3 X 3 subtriangle summing to 4.

%C Pattern 0 0 27 starts at n=11 and continues through at least n=60.

%e Maximal zeros solution for n=13

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

%e .............0.2

%e ............2.0.0

%e ...........0.0.2.0

%e ..........0.2.0.0.2

%e .........2.0.0.2.0.0

%e ........0.0.2.0.0.2.0

%e .......0.2.0.0.2.0.0.2

%e ......2.0.0.2.0.0.2.0.0

%e .....0.0.2.0.0.2.0.0.2.0

%e ....0.2.0.0.2.0.0.2.0.0.2

%e ...2.0.0.2.0.0.2.0.0.2.0.0

%e ..0.0.2.0.0.2.0.0.2.0.0.2.0

%K nonn

%O 3,2

%A _R. H. Hardin_ Jan 04 2009

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Last modified May 23 00:47 EDT 2022. Contains 353959 sequences. (Running on oeis4.)