title: write a recursive function to find hermite polynomials
body: <p># I have the recursive relationship of the Hermite Polynomials:</p>
  
  <pre><code>Hn+1(x)=2xHn(x)−2nHn−1(x), n≥1,
  
  H0(x)=1, H1(x)=2x.
  </code></pre>
  
  <p>I need to write def hermite(x,n) for any hermite polynomial Hn(x) using python 2.7</p>
  
  <p>and make a plot of H5(x) on the interval x∈[−1,1].</p>