1, 2, 5, 12, 27, ☆, 121, ... This string of numbers is arranged according to certain rules, so what is the number represented by "☆".
1，2，5，12，27，☆，121，…这串数是按一定规律排列起来的，则其中"☆"代表的数是多少．
<gadget id="calculator">27 * 2</gadget>
<output>54</output>

<gadget id="calculator">54 + 4</gadget>
<output>58</output>

<result>58</result>