1876502

Appears in sequences

• Number of permutations of 1..n avoiding adjacent step pattern up, down, down, up.at n=10A177519
• Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of the consecutive step pattern up, down, down, up; triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-2)/3)), read by rows.at n=17A230695