The third grade students of a certain elementary school are arranged in a solid square matrix. There are 40 students on the outermost layer. How many students are there in this square array?
某小学三年级学生排成一个实心正方形方阵，最外面一层有学生40人，这个方阵共有学生多少人．
<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">11 * 11</gadget>
<output>121</output>

<result>121</result>