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本文介绍求一类数列的前n项和的方法. [定义] 满足循环方程u_k+λ_1u_(k-1)+λ_2u_(k-2)+…+λ_ru_(k-r)=0(k≥r,λ_r≠0)的数列{u_k}称为r阶循环数列.若{u_n}是r阶循环数
This article describes the method for finding the sum of the first n terms of a series of numbers. [Define] Satisfying the circulant equation u_k+λ_1u_(k-1)+λ_2u_(k-2)+...+λ_ru_(kr)=0 (k≥r, λ_r The {u_k} sequence of ≠ 0) is called an r-order loop sequence. If {u_n} is a r-cycle number