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A146172
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-100-111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 117, 259, 1991, 4759, 52453, 136907, 6546215, 22604681, 6955049615, 33225401665, 5312086374693, 30690294218759, 6137053540967147, 42562920511505493, 35203573251917171119, 310505729227048458909
(list; graph; refs; listen; history; internal format)
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