34090

Appears in sequences

• Number of length-n permutations avoiding descent patterns aba and bab.at n=9A295974
• Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of the consecutive step patterns 010 or 101, where 1=up and 0=down; triangle T(n,k), n >= 0, k = max(0, n-3), read by rows.at n=24A295987
• a(n) = (n^4 + 5*n^3 + 11*n^2 + 7*n)/6.at n=20A332697