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 A154061 Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 5 X 5 X 5 subtriangle summing to 6. 0

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

%S 300,782,945,1120,906,954,767,352,274,247,240,284,240,240,240,240,284,

%T 240,240,240,240,284,240,240,240,240,284,240,240,240,240,284,240,240,

%U 240,240,284,240,240,240,240,284,240,240,240,240,284,240,240,240,240,284,240

%N Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 5 X 5 X 5 subtriangle summing to 6.

%C Pattern 240 284 240 240 240 starts at n=15 and continues through at least n=59.

%e Maximal zeros solution for n=15

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

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

%e ..............0.2.0

%e .............0.0.0.0

%e ............0.0.2.0.0

%e ...........2.0.0.0.0.2

%e ..........0.0.0.2.0.0.0

%e .........0.2.0.0.0.0.2.0

%e ........0.0.0.0.2.0.0.0.0

%e .......0.0.2.0.0.0.0.2.0.0

%e ......2.0.0.0.0.2.0.0.0.0.2

%e .....0.0.0.2.0.0.0.0.2.0.0.0

%e ....0.2.0.0.0.0.2.0.0.0.0.2.0

%e ...0.0.0.0.2.0.0.0.0.2.0.0.0.0

%e ..0.0.2.0.0.0.0.2.0.0.0.0.2.0.0

%K nonn

%O 5,1

%A _R. H. Hardin_ Jan 04 2009

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Last modified May 30 10:33 EDT 2023. Contains 363050 sequences. (Running on oeis4.)