四角链是由若干个单位正方形序列且任意相邻两个正方形之间只有一条割边构成的连通图。文中主要研究了n个单位正方形序列构成的四角链在两种不同构联接位下的Hosoya指标,并给出了具体表达式。
Quadrangular chain is a connected graph consisting of several unit square sequences, of which any two adjacent squares have only one cut edge. This paper presents the Hosoya index and its computational formula of Quadrangular chains made up by n unit square sequences under two non-isomorphic connected positions.