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A137308
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Number of dimer coverings on n X n square if n is even; number of dimer arrangements with exactly one monomer if n is odd.
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1
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1, 2, 18, 36, 2180, 6728, 2200776, 12988816, 20355006224, 258584046368, 1801272981919008, 53060477521960000, 1560858753560238398528, 112202208776036178000000, 13428038397958481723104394368
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