Let an be the number of 1 x n tile designs you can make using 1 x 1 squares available in 4 colors and 1 x 2 dominoes available in 5 colors. (a) First, find a recurrence relation to describe the problem. Explain why the recurrence relation is correct (in the context of the problem). (b) Write out the first 6 terms of the sequence a1, a2, ... (c) Solve the recurrence relation. That is, find a closed formula for an.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Let an be the number of 1 x n tile designs you can make using 1 x 1 squares
available in 4 colors and 1 x 2 dominoes available in 5 colors.

(a) First, find a recurrence relation to describe the problem. Explain why
the recurrence relation is correct (in the context of the problem).

(b) Write out the first 6 terms of the sequence a1, a2, ...

(c) Solve the recurrence relation. That is, find a closed formula for an.

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