Are you mad, man? 4!!=24!=620448401733239439360000. No way THAT's nice...*grin*. (It's a joke, ya see...)
Ah...math humor. And I'm assuming it's right...factorials of factorials parse that way. Anyone know for sure? (I'm too lazy to track down a reference, and I'm only about 80% sure). The funny thing is...I actually read it that way at first...I'm thinking "man, the factorial of four factorial...that's pretty big...oh *smack* those are exclamation points!"
Just some Friday night humor, folks.