returns the value of Catalan's constant.
        </li>
        <li>
          <b>CATALAN_ROW_NEXT</b> computes row N of Catalan's triangle.
        </li>
        <li>
          <b>CATALAN_VALUES</b> returns some values of the Catalan numbers for testing.
        </li>
        <li>
          <b>CHARLIER</b> evaluates Charlier polynomials at a point.
        </li>
        <li>
          <b>CHEBY_T_POLY</b> evaluates Chebyshev polynomials T(N)(X) of the first kind.
        </li>
        <li>
          <b>CHEBY