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A265657
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Number of 3Xn arrays containing n copies of 0..3-1 with no equal diagonal or antidiagonal neighbors and new values introduced sequentially from 0.
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1
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1, 7, 20, 104, 476, 2428, 12362, 64454, 342054, 1828533, 9928762, 54157257, 298686238, 1653956425, 9228016750, 51675269021, 290902199460, 1642884250719, 9314059354170, 52950162099266, 301906974462620, 1725418938358656
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