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A211087
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1/4 the number of n X n 0..3 symmetric matrices with every element equal to zero or one horizontal and vertical neighbors
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1
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1, 9, 324, 35343, 12487068, 14118092100, 51199696832895, 595365272306224965, 22199455509688700548632, 2654252181204304007637930258, 1017614219466672806577892453493568
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