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A240518
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Number of nX7 0..1 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..1 introduced in row major order
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1
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21, 86, 515, 3765, 28942, 231665, 1906245, 16000486, 135790448, 1158315893, 9946076742, 85823282205, 743139183617, 6451236349918, 56119492560507, 488978060398481, 4265874977466648, 37250999894755072, 325525391487428809
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