-4559domain: ZAppears in sequencesSequence is defined by property that binomial transform of (a0,a1,a2,a3,...) = (a0,a0,a0,a1,a1,a1,a2,a2,a2,a3,a3,a3,...).at n=15A051166Expansion of Sum_{k>=1} x^k/(1 + x^k)^4.at n=27A320901