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A145774
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only either two adjacent vertically or two adjacent horizontally.
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0
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1, 3, 5, 18, 124, 889, 9624, 117592, 3086899, 71342470, 3940302454, 162484045629, 19765145478158, 1482360209667114, 393627814809408705, 53489489176352337875, 30927278141339388397696, 7617052120730650394236371
(list; graph; refs; listen; history; internal format)
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