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A146456
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0010 pattern in any orientation.
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0
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1, 1, 1, 1, 3, 11, 31, 113, 699, 5221, 45431, 522967, 8016431, 151899461, 3697922071, 116129380717, 4687373528579, 240290198107395, 15846179275453485, 1336337926181858025
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