105508domain: NAppears in sequencesExpansion of f(-x, -x^7) / f(-x, -x) in powers of q where f(, ) is Ramanujan's general theta function.at n=39A132212a(n) = [x^n] Product_{k>=1} (1 + x^k)^(sigma_n(k)-k^n).at n=8A321261