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A183579
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Half the number of nX4 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors
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1
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8, 407, 9667, 240358, 5987795, 149355515, 3724940988, 92915045150, 2317648165893, 57811518197886, 1442053664104187, 35970710709296927, 897256757776720016, 22381259751777880373, 558280348730102033060
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