Number of equivalence classes of S_n under transformations of positionally adjacent elements of the form abc <--> cba where a<b<c.
A210668
Number of equivalence classes of S_n under transformations of positionally adjacent elements of the form abc <--> cba where a<b<c.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =60a(6) =260a(7) =1260a(8) =6744a(9) =39303
External references
- oeis: A210668