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A266933
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Number of nX6 binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.
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0
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2, 6, 19, 82, 429, 2577, 15850, 96503, 555060, 2977370, 14782970, 68041108, 291292442, 1165800099, 4383605127, 15564591521, 52423001756, 168200350788, 516045791503, 1519124991181
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