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A223120
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Number of nX2 0..2 arrays with no more than floor(nX2/2) 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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1, 10, 72, 664, 5376, 47968, 406400, 3585408, 30987264, 272565760, 2378450944, 20921604096, 183506403328, 1615798558720, 14215745994752, 125323120574464, 1104802314190848, 9750937675890688, 86084069811027968, 760548158573379584
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