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A229540
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Number of defective 3-colorings of a 7 X n 0..2 array connected horizontally, diagonally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..2 order.
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1
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0, 4212, 59626, 1379512, 26566266, 544403948, 10551803060, 205336122417, 3913347537410, 74172957575993, 1391260426025666, 25942784963976735, 480614597100202422, 8860662840757232528, 162602761260788194310
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