%I #8 Feb 25 2023 18:06:51

%S 1,2,1,1,3,2,2,7,3,6,15,12,17,63,47,86,272,269,423,2020,1609,3902,

%T 14951,18193,36083,200112,201396,575152,2652677,3907855,9200561

%N Number of planar n X n X n binary triangular grids symmetric both under 120-degree rotation and reflection with no more than 1 one in any 3 X 3 X 3 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009