%I #5 Apr 28 2021 00:16:38
%S 1,2,2,3,4,8,13,36,59,160,431,1207,3281,14493,40909,190825,830228,
%T 4020596,18120315,138139135,645018986,5068850751,37171002203,
%U 301985114648,2294433300268,29211683338424,229716243590382
%N Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 3 ones in any 3 X 3 X 3 subtriangle.
%K nonn
%O 0,2
%A _R. H. Hardin_, Jan 03 2009