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A146152
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Number of n X n binary arrays 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, 5, 13, 47, 375, 3972, 47068, 892007, 26215027, 1025956370, 55524872121, 4474246357794, 516153334755405, 83220252331733856, 19182699863712254411
(list; graph; refs; listen; history; internal format)
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