%I #3 Mar 31 2012 12:35:21
%S 715,3278,7090,8188,5593,4377,1618,601,228,220,220,220,220,220,220,
%T 220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,
%U 220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220
%N Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 4 X 4 X 4 subtriangle summing to 4.
%C Value 220 starts at n=13 and continues through at least n=60.
%e Maximal zeros solution for n=13
%e ..............0
%e .............0.0
%e ............0.0.2
%e ...........0.2.0.0
%e ..........2.0.0.0.0
%e .........0.0.0.0.2.0
%e ........0.0.0.2.0.0.0
%e .......0.0.2.0.0.0.0.2
%e ......0.2.0.0.0.0.2.0.0
%e .....2.0.0.0.0.2.0.0.0.0
%e ....0.0.0.0.2.0.0.0.0.2.0
%e ...0.0.0.2.0.0.0.0.2.0.0.0
%e ..0.0.2.0.0.0.0.2.0.0.0.0.2
%K nonn
%O 4,1
%A _R. H. Hardin_ Jan 04 2009
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