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A147264
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 5, 15, 33, 77, 553, 3895, 24243, 170053, 2059185, 30409467, 474043707, 8705603341, 222308455647, 7060172178631, 259928502701315
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