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A147356
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0110-0110-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 3, 9, 20, 53, 182, 863, 4532, 25697, 176361, 1505241, 14929100
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