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A222831
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Number of nX4 0..3 arrays with exactly floor(nX4/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order
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1
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6, 613, 114782, 23567385, 5026137016, 1093286140097, 240791286159691, 53509887603503644, 11973329684485913722, 2693909098107381431482, 608845475416039463267176, 138122543896575176671661121
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