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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 6 ones in any 4 X 4 X 4 subtriangle.
0

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

%S 1,2,2,4,5,11,19,64,124,431,1327,5041,16256,101123,343523,2315198,

%T 12588566,91251647,541807894,6226655381,40196314396,497995326239,

%U 5136985473929,68806411497081,764460274355923,16405775345542751

%N Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 6 ones in any 4 X 4 X 4 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_ Jan 03 2009