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A177556
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Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, down.
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0
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1, 6, 78, 1735, 59246, 2885772, 190320239, 16347310234, 1774441830858, 237627036224047, 38497690772499518, 7423393488778249536, 1680457375599950641631, 441370935373373671881586
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OFFSET
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1,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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