RosettaCodeData/Task/Left-factorials/EchoLisp/left-factorials-1.echolisp
2016-12-05 23:44:36 +01:00

5 lines
100 B
Text

(lib 'bigint)
(define (!n n)
(if (zero? n) 0
(+ (!n (1- n)) (factorial (1- n)))))
(remember '!n)