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A146055
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 2X3 U in any orientation.
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0
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1, 1, 5, 1, 19, 9, 285, 231, 16083, 5087, 1835713, 304405, 353122721, 80250539, 202921921043, 41930288075, 327077447429739, 40565746729487, 1135093267840644915, 110051860951495273, 8965200194852051792065
(list; graph; refs; listen; history; internal format)
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