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A223002
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Number of 3Xn 0..2 arrays with no more than floor(3Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order
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1
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5, 51, 534, 11114, 125907, 2889947, 34120953, 797183427, 9564934420, 226055677091, 2742385557524, 65313538746516, 798398966331091, 19117977479368059, 235001631223835081, 5649894487466132633
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