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A146786
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1100-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 3, 9, 27, 85, 337, 1791, 13253, 115267, 1169733, 14374957, 216583105, 4102635811, 98419728413, 2904752917775, 103834255604223, 4525458320487677
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