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A210671
Number of equivalence classes of S_n under transformations of positionally adjacent elements of the form abc <--> acb <--> bac <--> cba, where a<b<c.
6
1, 1, 2, 3, 4, 5, 8, 11, 20, 29, 57
OFFSET
0,3
CROSSREFS
Sequence in context: A103262 A135318 A374782 * A189761 A329576 A101137
KEYWORD
nonn
AUTHOR
Tom Roby, May 08 2012
EXTENSIONS
Definition improved by Tom Roby, May 15 2012
STATUS
approved