# 14

This was nice! Similar to the Lanterfish one. The naive way is to have a big string, but that becomes unfeasible quickly.

The solution was to keep track of the number of combinations available and at the end divide by 2 the counted elements. Rounding up so that the first and last element is not neglected as they are not doubled.

<details>
  <summary>Solutions</summary>
  <ol>
    <li>2988</li>
    <li>3572761917024</li>
  </ol>
</details>