A153997 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 12 ones in any 5 X 5 X 5 subtriangle.

1, 2, 2, 4, 16, 31, 122, 973, 3890, 30317, 486144, 3845485, 61098761, 1952652536, 30753790733, 973261651722, 61980407029298, 1943138871957133, 122570367648067555