%I #5 Apr 28 2021 00:14:18
%S 1,2,1,2,13,14,44,452,799,4626,86710,273752,2781435,91537826,
%T 508729354,9157300668,533484637064,5243172893020,166735484693868,
%U 17161483714082216,298035643554185774,16752470174524734906,3047662126271875592300
%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 2 X 2 X 2 subtriangle.
%K nonn
%O 0,2
%A _R. H. Hardin_, Jan 03 2009