Tetorial

The tetorial is a function invented by Aarex Tiaokhiao.Nested Factorial Notation - Aarex's Large Numbers (archived 2016-04-11) 
It's a type of nested factorial notation. The function is denoted and defined as n!! = (n!)!.
==Table of values==
n	(n!)!
0	1
1	1
2	2
3	720
4	6.2045*1023
5	6.6895*10198
6	2.6012*101746
==Sources==
Category:Factorials
Category:Functions
ja:二重階乗