Use red and white small squares of 1 square centimeter to form a large square. It is required that the four sides of the square are red and the middle is white. If more white squares are used than red squares, then the area of the large square is At least how many square centimeters.
用1平方厘米的红色和白色两种小正方形摆大正方形，要求摆出的正方形四边都是红色的，中间是白色的，如果所用的白色正方形比红色正方形多，那么摆出的大正方形的面积至少是多少平方厘米．
<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">7 * 7</gadget>
<output>49</output>

<result>49</result>