%I #5 Apr 28 2021 00:18:45

%S 1,2,2,3,8,6,19,86,201,747,4737,13222,67580,644447,2591663,18812351,

%T 265019022,1467585490,15658902928,326360337439

%N Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 4 ones in any 5 X 5 X 5 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009