Number of permutations of [n] with at least one strong fixed point (a permutation p of {1,2,...,n} is said to have j as a strong fixed point if p(k) < j for k < j and p(k) > j for k > j).
A006932
Number of permutations of [n] with at least one strong fixed point (a permutation p of {1,2,...,n} is said to have j as a strong fixed point if p(k) < j for k < j and p(k) > j for k > j).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =43a(5) =223a(6) =1364a(7) =9643a(8) =77545a(9) =699954a(10) =7013079a(11) =77261803a(12) =928420028a(13) =12085410927a(14) =169413357149
External references
- oeis: A006932