33324

Appears in sequences

• Number of key permutations of length n: permutations {a_i} with |a_i - a_{i-1}| = 1 or 2.at n=23A003274
• Triangle of numbers T(n,k) = number of permutations of n things with longest increasing subsequence of length <=k (1<=k<=n).at n=31A047887
• 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=58A047888
• Number of permutations in S_n with longest increasing subsequence of length <= 4.at n=8A047889
• Duplicate of A047889.at n=7A052397
• A simple grammar: labeled pairs of sequences of cycles.at n=6A052801
• Numbers k such that sigma(k) + phi(k) is a repdigit.at n=15A116019