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A145950
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected in a 3X2 elbow 1,1 1,2 1,3 2,3 in any orientation.
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0
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1, 1, 1, 9, 31, 205, 1307, 12227, 171281, 3266929, 85166971, 3120438693, 149314103237, 10059913232521, 894685834014771
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