%I #5 Apr 28 2021 00:14:06

%S 1,2,2,3,3,4,6,11,18,31,50,107,181,433,779,1919,3907,10795,25121,

%T 75000,190622,625348,1698419,6161541,18153209,72093319,233832256,

%U 1013942489,3627226950,17175822290,67626821845

%N Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 1 one in any 5 X 5 X 5 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009