Number of equivalence classes of S_n under transformations of positionally and numerically adjacent elements of the form abc <--> acb <--> cba where a<b<c.

A212432

Number of equivalence classes of S_n under transformations of positionally and numerically adjacent elements of the form abc <--> acb <--> cba where a<b<c.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =16a(5) =84a(6) =536a(7) =3912a(8) =32256a(9) =297072a(10) =3026112a(11) =33798720a(12) =410826624a(13) =5399704320a(14) =76317546240

External references