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A222848
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Number of nX1 0..2 arrays with no more than floor(nX1/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order
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5
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1, 1, 2, 10, 24, 72, 168, 664, 1632, 5376, 13152, 47968, 119936, 406400, 1017984, 3585408, 9082368, 30987264, 78761472, 272565760, 697493504, 2378450944, 6107523072, 20921604096, 53972262912, 183506403328, 474876108800
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