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A146800
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0110-1100-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 17, 31, 559, 1013, 8291, 23145, 356907, 1013595, 108749189, 407493401, 61299279691, 281660353619, 43848445982931, 246087198399431, 73605493456575165, 501006153269757647
(list; graph; refs; listen; history; internal format)
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