Number of n-permutations such that at least one cycle has size ceiling(n/2).

A229244

Number of n-permutations such that at least one cycle has size ceiling(n/2).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =9a(4) =40a(5) =200a(6) =1260a(7) =8820a(8) =72576a(9) =653184a(10) =6652800a(11) =73180800a(12) =889574400a(13) =11564467200a(14) =163459296000

External references