******** fig10.43 **********

	double
	eval( unsigned int n )
	{
		int i;
		double sum;

		if( n == 0 )
			return 1.0;

		sum = 0.0;
		for(i=0; i<n; i++ )
			sum += eval(i);
		return( 2.0 * sum / n + n );
	}