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A222789
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Number of nX3 0..3 arrays with exactly floor(nX3/2) 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, 4, 34, 582, 3800, 92642, 589134, 15697114, 101205850, 2768968458, 17982090240, 499074464184, 3254525287074, 91174422158328, 596469391588434, 16817976440314170, 110319637897696154, 3125091350637342914
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