84151254600domain: NAppears in sequencesExpansion of 1/(1-4*x)^(15/2).at n=11A020926G.f. C(x)^(1/2) satisfies C(x)^(1/2) - S(x)^(1/2) = 1 such that C'(x)*S(x)^(1/2) = S'(x)*C(x)^(1/2) = 72*x.at n=13A299855