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A190418
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Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 1 1 vertically, antidiagonally or horizontally
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1
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37, 290, 4174, 103218, 4268160, 302857233, 36530501839, 7448773789365, 2604518117252310, 1552614799946248963, 1570623177380821866672, 2710542814101229129928033, 7970415278138699394079102815
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