title: Number Pyramid Algorithm
body: <p>I was searching around the internet trying to find the algorithm of the following pyramid:</p>
  
  <pre><code>                           1
                          2  3  2
                       3  4  5  4  3
                    4  5  6  7  6  5   4
                 5  6  7  8  9  8   7  6  5   
              6  7  8  9  10 11 10  9  8  7  6
            7 8  9  10 11 12 13 12 11 10  9  8 7
         8  9 10 11 12 13 14 15 14 13 12 11 10 9  8
      9 10 11 12 13 14 15 16 17 16 15 14 13 12 11 10 9
  10 11 12 13 14 15 16 17 18 19 18 17 16 15 14 13 12 11 10
  </code></pre>
  
  <p>I wasn't able to find the algorithm, my question is: Does anyone know the algorithm and/or name for this type of pyramid?</p>
  
  <p>Any help is greatly appreciated. I'm sorry if anything in the post is wrong in some way, new posting here.</p>