-2514domain: ZAppears in sequencesExpansion of phi(q) / phi(q^3) in powers of q where phi() is a Ramanujan theta function.at n=64A139137a(n) = -3*a(n-1) + a(n-3), with a(0)=0, a(1)=-3, a(2)=12.at n=7A215919