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A146589
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0110-1111-0100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 9, 25, 67, 353, 1577, 17635, 202483, 2019113, 31077783, 570196985, 14569116993, 519350763601, 19917427060103, 942336566340751, 58234146292140447, 4596656821240313323, 484270777652058510713
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