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A301883
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Number of nX7 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
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1
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21, 154, 823, 5463, 33853, 223869, 1454613, 9620565, 63336647, 419113710, 2770472419, 18336620495, 121358670826, 803332031961, 5318434541385, 35208666237989, 233111781026276, 1543314708909090, 10218090869079319
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