A153934 - OEIS

A153934

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

%I #5 Apr 28 2021 00:18:39

%S 1,2,2,3,4,7,9,37,44,122,360,837,1955,11063,21562,102402,455597,

%T 1800255,6701316,61868659,193623470,1467251281,10855933316,

%U 68253791333,417351118269,6197640479557,31389717866283,387573069042758

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