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A230470
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Number of 2 X n 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.
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1
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0, 0, 0, 36, 216, 1260, 6912, 38340, 213192, 1188252, 6624720, 36934452, 205906968, 1147892364, 6399246240, 35674383780, 198876914280, 1108695761532, 6180739391088, 34456287198996, 192086358160824, 1070839950246252
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