Vigintation

Vigintation refers to the function \(a \uparrow^{18} b\), where Arrow Notation is used.

Vigintation can be written in array notation as {a,b,18}, in chained arrow notation as \(a \rightarrow b \rightarrow 18\) and in Hyper-E notation as E(a)1#1#1#1...1#1#1#b (17 ones).

Vigintational growth rate is equivalent to \(f_{17}(n)\) in the fast-growing hierarchy.