[racket] idiomatic and fast

From: Galler (lzgaller at optonline.net)
Date: Sat Apr 28 20:34:18 EDT 2012

;and without having to discard first two elements->


(build-list 21 (compose (λ (x) (/ (*  x 
                                        (+ x 1))
                                    2))
                          add1))



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