Between 1 and 2, write 3 for the first time; write 4 and 5 between 1 and 3; 3 and 2 for the second time (such as: 1...4...3...5...2), every time Write the sum of the two adjacent numbers between the two adjacent numbers that have already been written. This process was repeated eight times. So what is the sum of all the numbers?
在1，2两数之间，第一次写上3；第二次在1，3；3，2之间分别写上4，5(如：1…4…3…5…2)，每一次都在已写上的两个相邻数之间，写上这两个相邻数之和．这样的过程共重复了八次．那么，所有数之和是多少．
<gadget id="calculator">3 ** 1</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3 ** 3</gadget>
<output>27</output>

<gadget id="calculator">3 ** 4</gadget>
<output>81</output>

<gadget id="calculator">3 ** 5</gadget>
<output>243</output>

<gadget id="calculator">3 ** 6</gadget>
<output>729</output>

<gadget id="calculator">3 ** 7</gadget>
<output>2_187</output>

<gadget id="calculator">3 ** 8</gadget>
<output>6_561</output>

<gadget id="calculator">1 + 2 + 3 + 9 + 27 + 81 + 243 + 729 + 2_187 + 6_561</gadget>
<output>9_843</output>

<result>9_843</result>