-2832domain: ZAppears in sequencesLow-temperature partition function expansion for hexagonal lattice (Potts model, q=4).at n=21A057389Expansion of g.f. A(x) satisfying A( x^2*(1 + 3*x)*A(x) )^5 = A( x^3*(1 + 5*x)*A(x)^2 )^3.at n=5A370535