%I #3 Mar 31 2012 12:35:21
%S 1,2,2,4,16,31,126,1009,3933,31428,512187,4017316,64213559,2090787507,
%T 32776879657,1046731134966,68125822829775,2134091162950790,
%U 136215005250379929,17716724971218816648,1109196056459852373561
%N Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 13 ones in any 5 X 5 X 5 subtriangle.
%K nonn
%O 0,2
%A _R. H. Hardin_ Jan 04 2009