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Enneation or nonation refers to the 9th hyperoperation starting from addition. It is equal to $$a \uparrow^{7}b$$ in Knuth's up-arrow notation.[1]

Enneation can be written in array notation as $$\{a,b,7\}$$, in chained arrow notation as $$a \rightarrow b \rightarrow 7$$ and in Hyper-E notation as E(a)1#1#1#1#1#1#b.

Enneational growth rate is equivalent to $$f_8(n)$$ in the fast-growing hierarchy.

### Sources Edit

1. Enneation on Net Helper