<?php
        $args = array(
            'order'             => 'ASC',
            'hide_empty'        => true,
            'cache_domain'      => 'core'
        );
        $terms = get_terms('brand', $args);
        foreach ($terms as $item) {
          if ($item->count == 1) {
            $tax_query = '';
            $tax_query[] = array('taxonomy' => 'brand','field' => 'term_id','terms' => $item->term_id);
            $term_post = get_posts(array('post_type' => 'prod','tax_query' => $tax_query));
            if (!empty($term_post)) {
              $term_post_link = get_permalink($term_post[0]->ID);
              echo '<li><a href="'.$term_post_link.'">'.$item->name.'</a></li>';
            }
          } else {
            echo '<li>' . $item->name . '&nbsp;(' . $item->count . ')' . '</li>';
          }
        }
      ?>