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A267903
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Number of 3Xn arrays containing n copies of 0..3-1 with every element equal to at least one horizontal or vertical neighbor and the top left element equal to 0.
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1
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0, 6, 20, 268, 2324, 28318, 315196, 3786836, 45099306, 547824556, 6687936028, 82350672500, 1019550923830, 12691867518330, 158695413996448, 1992293553570646, 25099547132728742, 317210539882144928
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