191205

Appears in sequences

• Matrix product of Stirling1-triangle A008275(n,k) and unsigned Lah-triangle |A008297(n,k)|.at n=49A079639
• Binomial transform of A166242.at n=15A166452
• a(n) is the number of permutations of length n that avoid the pattern 321 and the mesh pattern (12, 427).at n=12A289600