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

%S 1,2,2,4,11,16,47,268,865,4671,46197,216961,1952323,31953148,

%T 252461942,3687648150,101320234793

%N Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 6 ones in any 5 X 5 X 5 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_ Jan 03 2009