Also consider (from http://en.wikibooks.org/wiki/Clojure_Programming/Examples):
(defn fib-seq []
((fn rfib [a b]
(lazy-cons a (rfib b (+ a b))))
0 1))
user> (take 20 (fib-seq))
(0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181)
Regards,
Tim.
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