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%I #5 Apr 28 2021 00:17:04
%S 1,2,2,3,5,6,12,35,83,231,918,2132,7575,42734,132320,609928,4694085,
%T 18109624,113969565,1148801096,6065910343,51213901318
%N Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 3 ones in any 5 X 5 X 5 subtriangle.
%K nonn
%O 0,2
%A _R. H. Hardin_, Jan 03 2009
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