Tetrofactorial

The tetrofactorial is a function based on tetration and factorial.Tetrofactorial - Extremely big numbers It's defined as \(n!2 = n↑↑(n-1)↑↑(n-2)↑↑...↑↑2↑↑1\) using hyperfactorial array notation. This has the growth rate of almost pentation.
Below are the first few tetrofactorials:
\(1!2 = 1\)
\(2!2 = 2↑↑1 = 2\)
\(3!2 = 3↑↑2↑↑1 = 3↑↑2 = 27\)
\(4!2 = 4↑↑3↑↑2↑↑1 = 4↑↑3↑↑2 = 4↑↑27\) ~ E153#25
\(5!2 = 5↑↑4↑↑3↑↑2↑↑1 = 5↑↑4↑↑3↑↑2 = 5↑↑4↑↑27\)
== Sources ==
== See also ==
Category:Factorials
Category:Functions