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A068472
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Number of n X n binary matrices with every 1 having at most 3 adjacent 1's.
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0
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2, 16, 496, 58640, 26536192, 45851039232, 302758305892480, 7638804476736307712, 736437724731312162567680, 271287639195997221896855543808, 381862430868672544566361613406502912
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