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This is a nice problem, but the solution test suit is poor.
To get 126 for n = 3 one need to assume same player always starts.
If either player could start we get more solutions.
I.E. number of solutions with 4 x's and 5 o's + number of solutions with 5 x's and 4 o's
https://www.mathworks.com/matlabcentral/cody/problems/44851 provides a more challenging extension that asks the user to take into account that games end when there's a "win".
My first attempt at producing a community problem so thanks for the feedback on improving the test suite.
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