三阶循环级数

循环级数是组合论中的重要内容之一，是计数和作算法分析的基础，它几乎对一切数学分支都有着重要作用。在生产和实践中也有着广泛的应用。给出了三阶循环级数及推广的通项的一般求法，为研究一般递归关系提供了理论上的解决方法。

Third Order Cyclic Series

The order cyclic series is one of the important contents of the combination theory, and it is the basis of counts and analysis of algorithm. It has the important value to most of the branches of mathematics and has extensive applications in products. This article provides the common solution of third order cyclic series and general term. And it also provides the theoretical solution in researching normal recursive relation.