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A145246
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1/6 of the number of 6-colorings of an n X n array symmetric about main diagonal.
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0
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1, 25, 2625, 1157625, 2144197125, 16680941258625, 545049010783958625, 74801401778343775334625, 43116460181763524110077949125, 104384410248808682805556599342377625
(list; graph; refs; listen; history; internal format)
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