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A223127
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Number of 2Xn 0..2 arrays with no more than floor(2Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order
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1
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2, 10, 64, 489, 3599, 27803, 212771, 1656545, 12904694, 101255205, 796288843, 6286246396, 49736262634, 394474774687, 3134464364251, 24950223830205, 198897142545467, 1587722400605459, 12689418744067169, 101527684281703007
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