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Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with every one adjacent to exactly 1 other one.
0

%I #3 Mar 31 2012 12:35:21

%S 1,1,1,1,1,2,3,2,6,7,11,23,54,60,238,445,901,2706,9076,14494,80321,

%T 212453,613603,2681494,12847248,29154102,230660451,862931932,

%U 3568146072,22105400251,150948368093,488469303948,5510650176739,29467826406958

%N Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with every one adjacent to exactly 1 other one.

%K nonn

%O 0,6

%A _R. H. Hardin_ Jan 04 2009