A column of numbers: 0, 1, 1, 2, 4, 7, 13, A, ... has a certain arrangement from left to right, so what is A?
一列数：0，1，1，2，4，7，13，A，…从左至右具有一定的排列规律，那么A是多少．
<gadget id="calculator">4 + 7 + 13</gadget>
<output>24</output>

<result>24</result>