250953

Appears in sequences

• a(n) = Sum_{k=0..n} binomial(2*k,k).at n=10A006134
• Number of rational knots of n crossings with signature 0 (chiral pairs counted twice).at n=21A078478
• Expansion of x/((1-x)*sqrt(1-4*x^2)).at n=21A100066
• Expansion of x/((1-x)*sqrt(1-4*x^2)).at n=22A100066
• Antidiagonal sums of A096465.at n=21A124642
• Expansion of (1+2x-sqrt(1-4x^2))/(2(1-x^2)*sqrt(1-4x^2)).at n=21A174783
• Riordan matrix (1/((1-x)*sqrt(1-4*x)),x/(1-x)).at n=55A187887