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A278609
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Number of nX6 0..3 arrays with rows and columns in lexicographic nondecreasing order but with exactly three mistakes.
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1
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728, 6208804, 23974522382, 70116431548595, 170796560376996116, 371605658574170955728, 735153310928503394971889, 1316116591708918219524268204, 2130452882466065540184080423698
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