Fill in the numbers according to the law: 1, (3/4), (5/9), (7/16), (9/25), (11/36)..., what is the 11th number
按规律填数：1、(3/4)、(5/9)、(7/16)、(9/25)、(11/36)…，第11个数是多少
<gadget id="calculator">2 * 11</gadget>
<output>22</output>

<gadget id="calculator">22 - 1</gadget>
<output>21</output>

<gadget id="calculator">11 ** 2</gadget>
<output>121</output>

<gadget id="calculator">21 / 121</gadget>
<output>21/121 = around 0.173554</output>

<result>21/121 = around 0.173554</result>