Doevigintation refers to the 22nd hyperoperation. It is equal to \(a \uparrow^{20} b\), using Knuth's up-arrow notation. [1]

Doevigintation can be written in array notation as \(\{a,b,20\}\), in chained arrow notation as \(a \rightarrow b \rightarrow 20\) and in Hyper-E notation as E(a)1#1#1#1...1#1#1#b (19 ones).

Doevigintational growth rate is equivalent to \(f_{21}(b)\) in the fast-growing hierarchy.

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