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A146031
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.
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0
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1, 1, 1, 1, 1, 1, 47, 87, 827, 1813, 23847, 61833, 1905275, 6035973, 614447855, 2474833329, 318082536355, 1576923345267, 332168016129555, 2011400450726835, 916006897110162895, 6848186045213206995, 6424521065702879448173
(list; graph; refs; listen; history; internal format)
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