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A069441
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Half the number of n X 3 binary arrays with no path of adjacent 1's or adjacent 0's from top row to bottom row.
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0
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4, 84, 1074, 11058, 102448, 896026, 7578952, 62820362, 514178822, 4174954460, 33725176208, 271523097884, 2181288088576, 17498432045552, 140241880816930, 1123280018219562, 8993350007112124
(list; graph; refs; listen; history; internal format)
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