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A265930
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Number of 2Xn 0..4 arrays with the absolute differences of each element with its with horizontal and antidiagonal neighbors unique.
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1
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25, 340, 1740, 9016, 44916, 223788, 1119424, 5621396, 28130560, 140718764, 704493864, 3528165236, 17658676752, 88394841700, 442557740144, 2215472575772, 11090095537400, 55519269652292, 277940545496176, 1391364670745476
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