`(c-ufactorial U) → list`syntaxUnary factorial. If the given list has length zero, yields the list

`'(u)`. If the given list has length one, yields the given list. Otherwise, yields a list containing items of the given list repeated`(N-1)!`times, where`N`is the length of the given list. This was named`c-fact`in the original implementation.(ck () (c-quote (c-ufactorial '(a b c)))) ;; ==> '(a b c a b c) ;; Because 3! = 6.