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A146872
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1110-0100-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 17, 29, 597, 1065, 7937, 22829, 200213, 509041, 58873393, 209855541, 45265003821, 200942562233, 23496039620441, 129320692683437, 19050505005054181, 117997121583703345
(list; graph; refs; listen; history; internal format)
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