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Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 5 ones in any 3 X 3 X 3 subtriangle.
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%I #5 Apr 28 2021 00:19:05

%S 1,2,2,3,15,24,95,901,2926,22625,415047,2632895,39794767,1442122393,

%T 17977314936,535815289761,38169625321927,935805308861487,

%U 54839755115620718,7680772354691458379,370282826884218784372

%N Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 5 ones in any 3 X 3 X 3 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009