A153907 - OEIS

A153907

Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 1 one in any 5 X 5 X 5 subtriangle.

%I #5 Apr 28 2021 00:14:13

%S 1,2,1,1,2,1,2,3,2,3,5,5,4,10,7,10,18,18,20,54,43,69,145,149,219,551,

%T 486,835,1828,2107,2978

%N Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 1 one in any 5 X 5 X 5 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009