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Enneadecation refers to the 19th hyperoperation starting from addition. It is equal to $$a \uparrow^{17} b$$ in Knuth's up-arrow notation.

Enneadecation can be written in array notation as $$\{a,b,17\}$$ and in chained arrow notation as $$a \rightarrow b \rightarrow 17$$.

Enneadecational growth rate is equivalent to $$f_18(n)$$ in the fast-growing hierarchy.

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