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A223121
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Number of nX3 0..2 arrays with no more than floor(nX3/2) 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, 64, 1154, 33604, 622568, 18539512, 354680696, 10596201904, 206498940320, 6177157242496, 121870726469408, 3647201710914880, 72609560768633600, 2173014662504367232, 43562628977274881408, 1303500230968158953728
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