(define series_sum_1
( lambda (n)
(if (= n 0) 0
(+ (/ 1.0 (* (+ n 1.0 )(+ n 2.0))) (series_sum_1(- n 1.0)))
) ) )
(writeln (series_sum_1 10))
(writeln (series_sum_1 100))
(writeln (series_sum_1 1000))
(writeln (series_sum_1 10000))
(writeln (series_sum_1 100000))
(writeln (series_sum_1 1000000))
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