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A146683
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1000-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 19, 27, 543, 1053, 10299, 25793, 392629, 1097335, 60249623, 207343851, 25905457375, 111844208423, 16258459672681, 83988272706599, 16883947506597523
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