Question: Let G = (V, E) be the undirected connected ladder graph shown in Fig. 11.94. For n ¥ 0, let an denote the number of

Let G = (V, E) be the undirected connected "ladder graph" shown in Fig. 11.94. For n ‰¥ 0, let an denote the number of ways one can select n of the edges in G so that no two edges share a common vertex. Find and solve a recurrence relation for an.

x1 x2 x3 Figure 11.94

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