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A269274
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Number of nX6 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.
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1
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1620, 1104264, 474819408, 174924572760, 59587625651904, 19356924219624936, 6090616046325570480, 1872977567099580289656, 566116324214731470647712, 168820920854627863029497352, 49802534018235803452666079376
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