A210671 Number of equivalence classes of S_n under transformations of positionally adjacent elements of the form abc <--> acb <--> bac <--> cba, where a

1, 1, 2, 3, 4, 5, 8, 11, 20, 29, 57

Offset: 0

Author

Tom Roby, May 08 2012

Keywords

• nonn

Links

• Steven Linton, James Propp, Tom Roby, and Julian West, Equivalence classes of permutations under various relations generated by constrained transpositions, 2011 arXiv:1111.3920 [math.CO], J. Int. Seq. 15 (2012) #12.9.1

Extensions

Definition improved by Tom Roby, May 15 2012