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 A154068 Number of planar triangular n X n X n nonnegative integer grids symmetric both under 120 degree rotation and reflection with every similarly oriented 4 X 4 X 4 subtriangle summing to 8. 0

%I #3 Mar 31 2012 12:35:22

%S 4,15,7,13,4,8,3,4,2,2,2,3,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,

%T 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2

%N Number of planar triangular n X n X n nonnegative integer grids symmetric both under 120 degree rotation and reflection with every similarly oriented 4 X 4 X 4 subtriangle summing to 8.

%C Value 2 starts at n=16 and continues through at least n=60.

%e Maximal zeros solution for n=16

%e .................2

%e ................0.0

%e ...............1.2.1

%e ..............1.0.0.1

%e .............0.2.0.2.0

%e ............2.0.1.1.0.2

%e ...........0.0.2.0.2.0.0

%e ..........1.2.1.0.0.1.2.1

%e .........1.0.0.1.2.1.0.0.1

%e ........0.2.0.2.0.0.2.0.2.0

%e .......2.0.1.1.0.2.0.1.1.0.2

%e ......0.0.2.0.2.0.0.2.0.2.0.0

%e .....1.2.1.0.0.1.2.1.0.0.1.2.1

%e ....1.0.0.1.2.1.0.0.1.2.1.0.0.1

%e ...0.2.0.2.0.0.2.0.2.0.0.2.0.2.0

%e ..2.0.1.1.0.2.0.1.1.0.2.0.1.1.0.2

%K nonn

%O 4,1

%A _R. H. Hardin_ Jan 04 2009

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Last modified October 2 02:58 EDT 2023. Contains 365831 sequences. (Running on oeis4.)