Arranging several 0 and 1 in a row (such as 00101, 11111, 10100, etc.) is called "dragon", and the total number of 0 and 1 in the dragon is called the length of the dragon. There are no two dragons connected by 1 called "green dragon" (such as 00101, 10100). How many dragons of length 10 are there?
将若干个0与1排成一行(如00101，11111，10100等)叫做"龙"，龙中数字0和1的总个数叫做龙的长度．没有两个1相连的龙叫做"青龙"(如00101，10100)．长度为10的青龙有多少个．
<gadget id="calculator">9 * 8</gadget>
<output>72</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">72 / 2</gadget>
<output>36</output>

<gadget id="calculator">8 * 7 * 6</gadget>
<output>336</output>

<gadget id="calculator">3 * 2 * 1</gadget>
<output>6</output>

<gadget id="calculator">336 / 6</gadget>
<output>56</output>

<gadget id="calculator">7 * 6 * 5 * 4</gadget>
<output>840</output>

<gadget id="calculator">4 * 3 * 2 * 1</gadget>
<output>24</output>

<gadget id="calculator">840 / 24</gadget>
<output>35</output>

<gadget id="calculator">6 * 5 * 4 * 3 * 2</gadget>
<output>720</output>

<gadget id="calculator">5 * 4 * 3 * 2 * 1</gadget>
<output>120</output>

<gadget id="calculator">720 / 120</gadget>
<output>6</output>

<gadget id="calculator">1 + 10 + 36 + 56 + 35 + 6</gadget>
<output>144</output>

<result>144</result>