223668

Appears in sequences

• Expansion of x/(sqrt(1-4*x^2) + x - 1).at n=14A100087
• Expansion of (1+sqrt(1-4*x))/(5*sqrt(1-4*x)-3).at n=7A104531
• Number of inversion sequences avoiding pattern 201 (or 210).at n=9A263777
• Expansion of e.g.f. exp(-3*x) / (1-x)^5.at n=7A383382