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A210671
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Number of equivalence classes of S_n under transformations of positionally adjacent elements of the form abc <--> acb <--> bac <--> cba, where a<b<c.
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6
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1, 1, 2, 3, 4, 5, 8, 11, 20, 29, 57
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listen;
history;
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internal format)
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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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Definition improved by Tom Roby, May 15 2012
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STATUS
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approved
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