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A147030
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 3, 13, 31, 77, 387, 2257, 17627, 156913, 1449769, 17078273, 269362403, 5270658519, 128747962057, 3752690933565, 128409913359645, 5451255918471683
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