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2012年高考数学全国新课卷理科第16题:数列{a_n}满足a_(n+1)+(-1)~na_n=2n-1,则{a_n}的前60项和为________。
2012 college entrance examination mathematics new curriculum science Section 16: The sequence {a_n} to meet a_ (n + 1) + (- 1) ~ na_n = 2n-1, then the first 60 items of {a_n} and ________.