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A146603
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 9, 11, 177, 325, 3375, 7559, 107583, 279679, 10392307, 32537343, 2182245881, 8257920539, 997413109357, 4566791847617, 859237621422427, 4726361744374801, 1501159569808633603, 9908601381191408811
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