title: Creating a 2d array in flutter / dart
body: <p>I'm brand new to flutter and dart. I've searched google and all I can find is how to make 1d lists in flutter. I need a chart of values.</p>
  
  <p>Specifically I need a row 12 long and a column 31 long filled with ascending numbers </p>
  
  <pre><code>1,  32,  63,
  
  2,  33,  64, 
  
  3,  34,  65,  etc....
  </code></pre>
  
  <p>thanks!</p>