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A190342
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Number of (n+1)X(n+1) symmetric binary matrices without the pattern 1 1 vertically, antidiagonally or horizontally
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1
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4, 12, 52, 308, 2520, 29268, 471012, 10566004, 331575100, 14510475976, 885694047808, 75478844279780, 8975435807171244, 1489232331953993836, 344849471434261285096, 111434896145450843664604
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