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Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 12 ones in any 5 X 5 X 5 subtriangle.
0

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

%S 1,2,2,4,16,31,122,973,3890,30317,486144,3845485,61098761,1952652536,

%T 30753790733,973261651722,61980407029298,1943138871957133,

%U 122570367648067555

%N Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 12 ones in any 5 X 5 X 5 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_ Jan 04 2009