159048domain: NAppears in sequencesNumber of polyiamonds with n cells without holes that do not tile the plane.at n=15A07133410^n+9^n-1.at n=5A155669Positive integers, c, such that there are more than two solutions to the equation a^2 + b^3 = c^4, with a, b > 0.at n=57A242381