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A267902
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Number of 2Xn arrays containing n copies of 0..2-1 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, 2, 3, 11, 29, 93, 268, 842, 2547, 7946, 24539, 76721, 239462, 751569, 2360679, 7437243, 23461543, 74155431, 234687456, 743792675, 2359972537, 7496293462, 23834595755, 75852059135, 241594260984, 770090455545, 2456436981617
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