which gives the solution to Euler's polygon division problem.
Segner's Recurrence Formula
See also
Catalan Number, Euler's Polygon Division ProblemExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Segner's Recurrence Formula." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SegnersRecurrenceFormula.html