Number of permutations of [n] having exactly one adjacent 2-cycle.

A370524

Number of permutations of [n] having exactly one adjacent 2-cycle.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =2a(4) =4a(5) =18a(6) =99a(7) =612a(8) =4376a(9) =35620a(10) =324965a(11) =3285270a(12) =36462924a(13) =440840358a(14) =5767387591a(15) =81184266632

External references