237135

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 2.at n=8A190823
• Number of permutations of n copies of 1..8 introduced in order 1..8 with no element equal to another within a distance of 2.at n=1A190933
• T(n,k)=Number of nXk arrays containing k copies of 0..n-1 with no equal horizontal, vertical or antidiagonal neighbors and new values introduced sequentially from 0.at n=43A265373
• 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=30A293157