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A177600
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Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, down, down.
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0
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1, 1, 20, 1680, 354624, 151213748, 114062310060, 139028830444866, 256400413791435360, 680598969845995094212, 2500271405904975564019712
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OFFSET
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0,3
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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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