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A221625
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Number of 3Xn arrays with each row a permutation of 1..n having at least as many downsteps as the preceding row
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1
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1, 4, 112, 6120, 738150, 148700748, 49096652080, 24099422236160, 17023170538890750, 16517958827528755300, 21433818529290626472948, 36180795747764068402865136, 77856103174007703918070147632
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