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Selected article 2


Fourteen ways of triangulating a hexagon
Image credit: User:Dmharvey

The

combinatorial mathematics
. The sequence begins:

5, 14, 42, 132
, ...

The

associating n applications of a binary operator as well as the number of ways that a convex polygon with n + 2 sides can be cut into triangles by connecting vertices with straight lines. (Full article...
)

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