A153960 - OEIS

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

%S 1,2,4,16,61,481,3632,56460,846246,26077855,775360108,47367748738,

%T 2788988175862,337520120950504,39370755765040186,9439231435010737547,

%U 2181450759732224994542,1036179888983780783839829

%N Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 8 ones in any 4 X 4 X 4 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_ Jan 03 2009