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A147160
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1100-0111-0100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 9, 25, 53, 97, 275, 939, 2977, 11455, 54387, 273381, 1565737, 8740687, 56416565, 398132663
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