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A190422
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Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 1 1 diagonally, vertically, antidiagonally or horizontally
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0
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34, 254, 3444, 76352, 2733816, 163925231, 16307921090, 2666369228454, 724501421348158, 326444188458835963, 242909750685458209759, 299419887986747081985221, 611366002048450741040107233
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