Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsStirling's Approximation versus n!http://demonstrations.wolfram.com/StirlingsApproximationVersusN/]]>http://demonstrations.wolfram.com/StirlingsApproximationVersusN/Euler-Maclaurin Summation Formulahttp://demonstrations.wolfram.com/EulerMaclaurinSummationFormula/]]>http://demonstrations.wolfram.com/EulerMaclaurinSummationFormula/