Observe the law of the following sequence of numbers: 1, (4/3), (9/5), (16/7), (25/9), ... then what is the seventh number.
观察下面一列数的规律：1，(4/3)，(9/5)，(16/7)，(25/9)，…则第七个数为多少．
<gadget id="calculator">7 * 7</gadget>
<output>49</output>

<gadget id="calculator">9 + 2 + 2</gadget>
<output>13</output>

<gadget id="calculator">49 / 13</gadget>
<output>49/13 = around 3.769231</output>

<result>49/13 = around 3.769231</result>