I am solving spoj problem Tiling a Grid With Dominoes.(http://www.spoj.pl/problems/GNY07H/).. I am not able to come up with a recurrence relation.. One of my friend said it has the recurrence relation as f(n) = f(n-1) + 5*f(n-2) + f(n-3) - f(n-4). I am not convinced and have trouble deriving this formula from given data..Can somebody help??
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