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A047941
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Number of 6-colorings of an n X n grid, up to rotational symmetry.
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1, 6, 336, 2521476, 705277897416, 7107572010747738816, 2578606199622659276537193216, 33678386561031835867238388699701784576, 15835071665743319426540573726368249140484891508736
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