164140domain: NAppears in sequencesExpansion of f(-x^6, -x^12)^2 / (f(-x, -x) * f(-x^3, -x^15)) in powers of x where f(, ) is Ramanujan's general theta function.at n=31A261240Expansion of Sum_{k>0} k * x^k / (1 - k * x^k)^(k+1).at n=19A360823