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

%S 1,2,2,4,15,26,94,703,2648,19064,286301,1973740,27808647,785297090,

%T 10274423975,271526039324

%N Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 9 ones in any 5 X 5 X 5 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_ Jan 03 2009