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A146145
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Number of n X n binary arrays symmetric under horizontal reflection 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, 1, 1, 1, 55, 103, 1119, 2577, 44665, 124149, 7114043, 25427717, 3924887627, 18243132743, 3963931303667, 23264020620581, 10118413718310299, 75049948209301973, 78694111409932613371, 745465591245660563073
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