<image> As shown in the figure, in a 2×2 grid, drawing a straight line through 3 squares results in an increase of 18 segments in the figure; in a 3×3 grid, drawing a straight line through 5 squares results in an increase of 39 segments in the figure; then in a 5×5 grid, drawing a straight line through 9 squares will result in an increase of ____ segments in the figure.