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%I #5 Apr 28 2021 00:15:43
%S 1,2,1,1,2,4,9,26,49,114,335,860,2642,11403,31366,122074,649249,
%T 2617092,13723850,92885894,495630474,3323403054,28712335687,
%U 193014843154,1677713274836,19022134210553,161885710747705,1807982773217565
%N Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 4 X 4 X 4 subtriangle.
%K nonn
%O 0,2
%A _R. H. Hardin_, Jan 03 2009
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