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A147020
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 01000-11111-01000 pattern in any orientation.
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0
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1, 1, 1, 1, 3, 1, 15, 9, 133, 33, 3625, 1063, 187163, 37071, 15421524, 1848587, 2304715815, 239808955, 763574051396, 59268926793, 494418074953389, 27771432799839
(list; graph; refs; listen; history; internal format)
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