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QUESTION
Given a convex polygon with n vertices, we can divide it into several separated pieces, such that every piece is a triangle.
Given a convex polygon with n vertices, we can divide it into several separated pieces, such that every piece is a triangle. When n = 4, there are two different ways to divide the polygon; When n = 5, there are five different ways. Give an algorithm that decides how many ways we can divide a convex polygon with n vertices into triangles
