-77616domain: ZAppears in sequencesa(n) = binomial(2*n, n)^2 / (1-2*n).at n=6A010370Coefficient triangle of numerator polynomials appearing in certain column o.g.f.s related to the H-atom spectrum.at n=41A120078Numerator of Sum_{k=0..n} binomial(n,k)*(-1)^k/(k^2+1).at n=7A190948