A153967 - OEIS

A153967

Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 9 ones in any 4 X 4 X 4 subtriangle.

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

%S 1,2,2,4,7,15,30,103,229,913,3237,14316,56401,399787,1756484,13874163,

%T 97904334,862620519,6788122417,96037644217,842802659086,

%U 13301955362056,187438690067450,3299373199801311,51852238684408496,1465485312975753622

%N Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 9 ones in any 4 X 4 X 4 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_ Jan 03 2009