n
              type of the function <a class="link" href="../functions/at.html" title="at"><code class="computeroutput"><span class="identifier">at</span></code></a>. <a class="link" href="../../../sequence.html" title="Sequence">Sequence</a>(s)
              typically return references to its elements via the <a class="link" href="../functions/at.html" title="at"><code class="computeroutput"><span class="identifier">at</span></code></a> function. If you want to
              get the actual element type, u