332507

Appears in sequences

• Number of permutations of 2 copies of 1..n introduced in order 1..n with no element equal to another within a distance of 4.at n=9A190825
• Number of finite, negative, totally ordered monoids of size n (semigroups with a neutral element that is also the top element).at n=8A253950
• Triangle read by rows: T(n,k) = number of linear chord diagrams with n chords such that every chord has length at least k (1 <= k <= n).at n=40A293157
• Number of compositions (ordered partitions) of n into squarefree parts (A005117) such that no two adjacent parts are equal (Carlitz compositions).at n=27A301500