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A146816
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1110-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 19, 31, 717, 1507, 20113, 52053, 1344751, 4220463, 406071927, 1625689575, 292516297827, 1472388906019, 367500695278431, 2286735420596063
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