Number of simple symmetric permutations of degree 2n (or 2n+1).

A198434

Number of simple symmetric permutations of degree 2n (or 2n+1).

Terms

    a(0) =2a(1) =10a(2) =90a(3) =966a(4) =12338a(5) =181470a(6) =3018082a(7) =55995486a(8) =1146939010a(9) =25716746430a(10) =626755197698

External references