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A146056
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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 2X3 U in any orientation.
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0
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1, 1, 1, 1, 5, 1, 21, 9, 145, 29, 1925, 153, 28297, 2069, 734141, 42313, 33360929, 973281, 2205341673, 38746505, 212529048997, 2736250609, 33748456381053, 283141781389, 8526059147670681, 43072398238613, 3258206098233834291
(list; graph; refs; listen; history; internal format)
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