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A146151
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.
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0
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1, 1, 1, 3, 9, 27, 119, 633, 3943, 30791, 332473, 4676705, 79725173, 1817184081, 50545874411, 1811092006865
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