A153947 - OEIS

A153947

Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 6 ones in any 4 X 4 X 4 subtriangle.

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

%S 1,2,2,4,11,23,83,542,2154,15035,184615,1315991,16739106,377984235,

%T 5010747205,118406407922,4950057264228,123458500863829

%N Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation 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