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%I #5 Apr 28 2021 00:18:33
%S 1,2,4,13,26,135,581,5081,33999,455470,5028919,110445068,1936072745,
%T 69174531647,1977766145879,114385090415133,5299105178883837,
%U 494911099658091565,37117101455488584937
%N Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 4 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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