A153914 - OEIS

A153914

Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 4 X 4 X 4 subtriangle.

%I #5 Apr 28 2021 00:15:43

%S 1,2,1,1,2,4,9,26,49,114,335,860,2642,11403,31366,122074,649249,

%T 2617092,13723850,92885894,495630474,3323403054,28712335687,

%U 193014843154,1677713274836,19022134210553,161885710747705,1807982773217565

%N Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 4 X 4 X 4 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009