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A154050 Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 5 X 5 X 5 subtriangle summing to 5. 0

%I #3 Mar 31 2012 12:35:21

%S 0,25,72,0,28,61,0,13,43,0,0,27,0,0,27,0,0,27,0,0,27,0,0,27,0,0,27,0,

%T 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 5 X 5 X 5 subtriangle summing to 5.

%C Pattern 0 0 27 starts at n=14 and continues through at least n=57.

%e Maximal zeros solution for n=16

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

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

%e ...............1.0.0

%e ..............0.0.1.0

%e .............0.0.0.1.1

%e ............1.0.0.1.0.0

%e ...........0.1.1.0.0.0.0

%e ..........0.1.0.0.1.0.0.1

%e .........1.0.0.0.0.1.1.0.0

%e ........0.0.1.0.0.1.0.0.1.0

%e .......0.0.0.1.1.0.0.0.0.1.1

%e ......1.0.0.1.0.0.1.0.0.1.0.0

%e .....0.1.1.0.0.0.0.1.1.0.0.0.0

%e ....0.1.0.0.1.0.0.1.0.0.1.0.0.1

%e ...1.0.0.0.0.1.1.0.0.0.0.1.1.0.0

%e ..0.0.1.0.0.1.0.0.1.0.0.1.0.0.1.0

%K nonn

%O 5,2

%A _R. H. Hardin_ Jan 04 2009

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Last modified August 22 23:56 EDT 2024. Contains 375369 sequences. (Running on oeis4.)