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A184501
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1/12 the number of (n+2)X5 0..2 arrays with each 3X3 subblock containing one of one value, three of another, and five of the last
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1
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6132, 17077, 50590, 161097, 579771, 2185733, 8600335, 36366658, 156863626, 689415818, 3168631633, 14630695130, 67976252871, 325283270950, 1553794150160, 7427099657330, 36244496322073, 176177225797658, 855011742964725
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