230816domain: NAppears in sequencesExpansion of (1+4*x+8*x^2+8*x^3+7*x^4+4*x^5+2*x^6) / (1-x-7*x^2-12*x^3-6*x^4-7*x^5-4*x^6-2*x^7).at n=9A275909G.f.: x * (d/dx) x * Product_{k>=1} (1 + x^k)^(a(k)/k).at n=15A308433