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A069430
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Half the number of 4 X n 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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7, 88, 1074, 13002, 157058, 1896074, 22886754, 276246170, 3334295986, 40244915946, 485755429442, 5863058792506, 70767006224978, 854156391897098, 10309651065637602, 124437288171423322
(list; graph; refs; listen; history; internal format)
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