A153932 - OEIS

A153932

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

%I #5 Apr 28 2021 00:18:26

%S 1,2,2,3,8,13,39,225,564,2858,24012,101231,758165,10608857,69903886,

%T 854166606,19155776749,207379552763,4126912621572

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

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009