99632332800domain: NAppears in sequencesExpansion of e.g.f.: (1+2*x-2*x^2)/(1-x)^2.at n=13A052572E.g.f. 1/(1-x^2-x^3).at n=13A052597E.g.f. (1+x-x^2)^2/(1-x)^2.at n=13A052643Expansion of e.g.f. Sum_{k>=1} arctanh(x^k).at n=13A330505