Intersecting Polygon

A polygon with \( n \ge 3 \) vertices has the following edges: \( P_1P_2, P_2P_3 , \dots , P_n P_1 \)

Let \(A_n\) denote the maximal amount of intersections of those edges, if no two of them lie on the same line.

Compute \(A_{2015}+ A_{2016} \).

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