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A147153
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1100-0111-0010 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 5, 29, 53, 103, 395, 1381, 4229, 19741, 89165, 570891, 3054965, 21029525, 147769545, 1255506947
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