306570

Appears in sequences

• Number of permutations of [n] cyclically avoiding the consecutive step pattern UDU (U=up, D=down).at n=10A232899
• Number T(n,k) of permutations of [n] with exactly k (possibly overlapping, cyclic wrap-around) occurrences of the consecutive step pattern UDU (U=up, D=down); triangle T(n,k), n>=0, 0<=k<=floor(n/2), read by rows.at n=30A232933