function seriesClosure( lambda ) {
	var lk;
	var k;
	k = 1;
	lk = lambda;
	return seriesElement;

	/**
	* Returns the current series element.
	*
	* @private
	* @returns {number} series element
	*/
	function seriesElement() {
		k += 1;
		lk *= lambda;
		return lk * factorialln( k ) / factorial( k );
	}
}
Returns a function to retrieve elements of the series \\( \sum_{k=0}^{\infty} \frac{ \lambda^k \log(k!) }{ k! } \\).

@private
@param {NonNegativeNumber} lambda - mean parameter
@returns {Function} function to retrieve series elements