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A147455
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11000-01111-11000 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 3, 9, 19, 53, 174, 577, 2638, 14887, 91688, 621981, 4953292, 45339549, 483440905, 6106017477, 89757755470, 1517774827657, 29582954137388
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