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A269029
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Number of nXn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once.
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1
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0, 24, 348, 18384, 1326576, 208867428, 63310818360, 40013955378312, 51911512873697772, 140039775591497709312, 791864652110724378938904, 9334169232033820587188999592, 232675011644185023762453520339476
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