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A068244
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1/6 the number of colorings of a 3 X 3 rhombic- or staggered- hexagonal array with n colors.
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0
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1, 176, 5490, 65600, 455875, 2239776, 8647716, 27962880, 78920325, 200002000, 464447126, 1003294656, 2039332295, 3935444800, 7261533000, 12884914176, 22089914121, 36733221360, 59442494650, 93866696000, 144987663051
(list; graph; refs; listen; history; internal format)
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