Counting Tilings
Number of domino tilings of an `n × m` grid, modulo `10^9 + 7`. A domino is an anchor cell plus an orientation (`true` = horizontal, covering the cell to the right; `false` = vertical, covering the cell below).
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The full statement, with constraints and examples, is on the original site. The specification is at TalosEval/Problems/CSES/CountingTilings/Spec.lean.
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