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Number of planar n X n X n binary triangular grids symmetric both under 120-degree rotation and reflection with no more than 1 one in any 4 X 4 X 4 subtriangle.
0

%I #8 Feb 25 2023 18:06:42

%S 1,2,1,1,2,2,2,4,3,5,6,8,8,24,15,28,52,66,85,246,226,453,898,1300,

%T 1806,6204,5820,13820,31156,51179,81402

%N Number of planar n X n X n binary triangular grids symmetric both under 120-degree rotation and reflection with no more than 1 one in any 4 X 4 X 4 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009