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A297218
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Number of n X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1's.
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1
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1, 4, 24, 207, 5570, 261939, 20599895, 3819208252, 1400212345305, 937962844219314, 1312275096984570369, 3708386833907642906568, 20177474743877943669370721, 220442917573207336661039688056
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