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A268734
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Number of n X n binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.
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1
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0, 4, 80, 2876, 200204, 29134076, 9039552112, 6084192150856, 8965720251221240, 29122359898196696856, 209490003763160695865576, 3348908247850171650090422060, 119286836904111393911302107179212
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