Create a function that returns the nth catalan number.In combinatorial mathematics, the Catalan numbers form a sequence of natural numbers that occur in various counting problems, often involving recursively-defined objects. They are named after the Belgian mathematician Eugène Charles Catalan (1814-1894). For more info, check out the resource tab. Examples getCatalanNumber (0) 1 getCatalanNumber (6) → 132 getCatalanNumber (8) - 1 1430 Notes Inputs are zero and positive integers.

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