Polygon Triangulations

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There are 2 triangulations for a square, 5 for a pentagon, 14 for a hexagon, 42 for a heptagon, and 132 for an octagon. The numbers 2, 5, 14, 42, 132, ..., are the Catalan numbers.

Contributed by: Ed Pegg Jr (March 2011)
Open content licensed under CC BY-NC-SA




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