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%I #3 Mar 31 2012 12:35:21
%S 14,25,24,27,22,18,15,16,15,15,16,15,15,16,15,15,16,15,15,16,15,15,16,
%T 15,15,16,15,15,16,15,15,16,15,15,16,15,15,16,15,15,16,15,15,16,15,15,
%U 16,15,15,16,15,15,16,15,15,16,15,15
%N Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 3 X 3 X 3 subtriangle summing to 4.
%C Pattern 15 16 15 starts at n=9 and continues through at least n=60.
%e Maximal zeros solution for n=9
%e ..........2
%e .........0.0
%e ........0.2.0
%e .......2.0.0.2
%e ......0.0.2.0.0
%e .....0.2.0.0.2.0
%e ....2.0.0.2.0.0.2
%e ...0.0.2.0.0.2.0.0
%e ..0.2.0.0.2.0.0.2.0
%K nonn
%O 3,1
%A _R. H. Hardin_ Jan 04 2009
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