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A278650
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Number of nX2 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes.
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1
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0, 0, 24, 1076, 19893, 235446, 2080575, 14836233, 89504692, 471646066, 2221297222, 9512455863, 37536099773, 137924875200, 475940969064, 1553081484256, 4820235461752, 14298088612192, 40701436072216, 111582345485761
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