46508

Appears in sequences

• Number of configurations, excluding reflections and black-white interchanges, of n black and n white beads on a string.at n=10A045723
• Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of the generalized pattern 23-1; triangle T(n,k), n>=0, 0<=k<=A125811(n)-1, read by rows.at n=50A260670
• Number of permutations of [n] with exactly three (possibly overlapping) occurrences of the generalized pattern 23-1.at n=4A264462