586590

Appears in sequences

• Number of permutations in S_n with longest increasing subsequence of length <= 3 (i.e., 1234-avoiding permutations); vexillary permutations (i.e., 2143-avoiding).at n=10A005802
• Rectangular array of numbers a(n,k) = number of permutations of n things with longest increasing subsequence of length <= k (1 <= k <= oo), read by antidiagonals.at n=68A047888
• The number of Motzkin paths of length n satisfying the red-blue rule.at n=19A389602