122864domain: NAppears in sequencesMcKay-Thompson series of class 20A for the Monster group.at n=31A112158McKay-Thompson series of class 20A for the Monster group with a(0) = 4.at n=31A210459a(n) = [x^n] Product_{k>=1} (1 + x^(k^2))^n.at n=13A301518