%I #3 Mar 31 2012 12:35:22
%S 10,25,36,74,46,40,70,47,49,20,13,19,17,13,13,13,13,13,13,13,13,13,13,
%T 13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,
%U 13,13,13,13,13,13,13,13,13,13,13
%N Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 4 X 4 X 4 subtriangle summing to 6.
%C Value 13 starts at n=17 and continues through at least n=60.
%K nonn
%O 4,1
%A _R. H. Hardin_ Jan 04 2009
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