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A302164
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Number of 2Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
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4
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2, 3, 9, 17, 25, 65, 185, 385, 649, 1489, 3929, 8609, 15913, 34545, 85497, 191809, 377545, 802961, 1894553, 4279521, 8785769, 18612785, 42501945, 95817857, 202153993, 429672401, 960801241, 2153871393, 4621792425, 9879318897
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