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A280852
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Number of n X n 0..2 arrays with no element equal to more than one of its king-move neighbors and with new values introduced in order 0 sequentially upwards.
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0
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1, 9, 46, 124, 282, 712, 1738, 4124, 9562, 21752, 48730, 107992, 237082, 516376, 1117210
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