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A145959
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a zee 1,1 1,2 2,2 2,3 in any orientation.
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0
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1, 1, 1, 5, 17, 75, 405, 2821, 26895, 365651, 6440881, 149278281, 4554728635, 183204987539, 9796495036771, 702723336742467
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