-2154domain: ZAppears in sequencesExpansion of e.g.f. exp(arctan(x)/exp(x)).at n=7A013571Expansion of (1 + x)/(1 + x + 3*x^2).at n=16A110523Expansion of Product_{k>=1} ((1 + x)^k + x^k)/((1 + x)^k - x^k).at n=23A307521G.f.: 1 + 1*x/(1 + 2*x^2/(1 + 3*x^3/(1 + 4*x^4/(1 + 5*x^5/(1 + ...))))).at n=18A343468