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A069429
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Half the number of 3 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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92
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3, 16, 84, 440, 2304, 12064, 63168, 330752, 1731840, 9068032, 47480832, 248612864, 1301753856, 6816071680, 35689414656, 186872201216, 978475548672, 5123364487168, 26826284728320, 140464250421248
(list; graph; refs; listen; history; internal format)
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