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A145944
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected in a 3X2 elbow 1,1 1,2 1,3 2,3 in any orientation.
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0
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1, 1, 1, 1, 13, 19, 595, 1473, 41647, 139371, 13954303, 64086157, 18839470495, 119460750005, 78516712094765, 679135834059151, 1132864641733411477, 13390989972487068017, 60598468634533341708705, 981938713996881194950713
(list; graph; refs; listen; history; internal format)
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