A153948 - OEIS

%I #3 Mar 31 2012 12:35:21

%S 1,2,4,16,48,338,2112,27873,325940,7927215,173294023,7887044079,

%T 319688425834,27098632121268,2049789115719959,323784392678130807,

%U 45665932705751433387,13440450508552654148691

%N Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 6 ones in any 4 X 4 X 4 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_ Jan 03 2009