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A140196
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Number of symmetric binary n X n matrices with every 1 adjacent horizontally (and vertically) to some 0.
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0
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1, 5, 21, 175, 2665, 69147, 3183841, 259010439, 36989095651, 9310549716061, 4127913626714981, 3221885485823007739, 4428893445413111685241, 10721218357954583752212691, 45702135675375111739043639093
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