 class="special">)</span></code>.
      </p>
<p>
        <span class="bold"><strong>Important:</strong></span> there are two competing definitions
        of Tangent numbers in common use (depending on whether you take the even
        or odd numbered values as non-zero), we use:
      </p>
<div class="blockquote"><blockquote class="blockquote"><p>
          <span class="inlinemediaobject"><img src="../../../equations/tangent_number_def.svg"></span>

        </p></blockquote></div>
<p>
        Which gives:
