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A222796
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Number of 3Xn 0..3 arrays with exactly floor(3Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order
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1
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0, 8, 34, 275, 888, 14292, 62072, 1144030, 5213239, 98670352, 454254970, 8668405392, 40062023836, 768672153916, 3564115006844, 68657814382115, 319237701630821, 6169004369711478, 28754090389217238, 557059581178953846
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