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A147186
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 11000-01110-00011 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 7, 9, 31, 55, 787, 1573, 22701, 53447, 1146545, 3177491, 131825683, 433244499, 34337767649, 134703759045, 16271838583281, 75677568824871, 14799633241575103, 81580228946827257
(list; graph; refs; listen; history; internal format)
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