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A146039
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.
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0
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1, 1, 1, 1, 9, 13, 45, 103, 3815, 10121, 444625, 1564307, 156192449, 708716121, 155685558737, 926098788583, 445436128809681, 3444294518750191, 3885959472155218673, 39161185591962243237, 94947827514803095335545
(list; graph; refs; listen; history; internal format)
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