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A146681
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-1100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 9, 21, 93, 334, 1347, 5976, 45869, 290540, 3087921, 28902351, 440901387, 5686714599
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