yaworsw/euler-manager

---
:id: 215
:name: Crack-free Walls
:url: https://projecteuler.net/problem=215
:content: |+
  Consider the problem of building a wall out of 2×1 and 3×1 bricks (horizontal×vertical dimensions) such that, for extra strength, the gaps between horizontally-adjacent bricks never line up in consecutive layers, i.e. never form a "running crack".

  For example, the following 9×3 wall is not acceptable due to the running crack shown in red:

   ![]({{ images_dir }}/p215_crackfree.gif)

  There are eight ways of forming a crack-free 9×3 wall, written W(9,3) = 8.

  Calculate W(32,10).