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A228798
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Number of 3 X n binary arrays with top left element equal to 1 and no two ones adjacent horizontally or nw-se.
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1
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4, 5, 36, 97, 411, 1394, 5223, 18708, 68348, 247545, 899960, 3266477, 11864371, 43080054, 156446379, 568106600, 2063027108, 7491613757, 27204943788, 98791463513, 358749562651, 1302756292618, 4730805017359, 17179356326908
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