810375651domain: NAppears in sequencesa(n) = Sum_{k=0..n} binomial(2*k,k).at n=16A006134Number of rational knots of n crossings with signature 0 (chiral pairs counted twice).at n=33A078478Expansion of x/((1-x)*sqrt(1-4*x^2)).at n=33A100066Expansion of x/((1-x)*sqrt(1-4*x^2)).at n=34A100066Antidiagonal sums of A096465.at n=33A124642