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By: a guest on Jun 21st, 2012  |  syntax: None  |  size: 0.37 KB  |  hits: 7  |  expires: Never
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  1. (defn pascals-triangle []
  2.   "Return a lazy seq of rows of Pascal's triangle."
  3.   (letfn [(next-row [row]
  4.             (reduce (fn [v' v] (conj v' (apply +' (take 2 v)))) ; (take 2) returns [1] at the right edge
  5.                     [1]                                         ; Left edge
  6.                     (take (count row) (iterate rest row))))]
  7.     (iterate next-row [1])))
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