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A146153
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only either as two by three or three by two blocks.
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0
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1, 1, 3, 3, 9, 11, 82, 254, 1669, 6665, 68316, 226521, 4561686, 23734103, 704383992, 5907579541, 236178663400, 2337315883467, 150056765859689, 1811327966926780, 189399759509400492, 3276661629995792339, 507766610202105772758
(list; graph; refs; listen; history; internal format)
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