1337866

Appears in sequences

• Expansion of (1+x^3*C^3)*C^4, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.at n=11A071737
• a(n) is the number of permutations of length n that avoid the pattern 321 and the mesh pattern (12, 179) or the same sequence for the mesh patterns (12, 185), (12, 314), (12, 410).at n=14A289590