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A047939
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Number of 4-colorings of an n X n grid, up to rotational symmetry.
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0
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1, 4, 70, 65824, 1073758336, 281474993496064, 1180591620734591303680, 79228162514264619068554215424, 85070591730234615870455337878516924416, 1461501637330902918203686041642102636484130504704
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