What is the recursive rule for Paving Patterns POW 2 on finding how many ways to lay out a 20 foot path?

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What is the recursive rule for Paving Patterns POW 2 on finding how many ways to lay out a 20 foot path?

The path is to be exactly 2 feet wide. Each paving stone is rectangular, with the dimensions 1 foot by 2 feet. Al and Betty want to know how many different ways there are to lay out the stones. The path is 20 feet long altogether.

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What is the recursive rule for Paving Patterns POW 2 on finding how many ways to lay out a 20 foot path?

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