20556578700domain: NAppears in sequencesModular form of level 4 and weight 1/2.at n=20A013975Exponents a(1), a(2), ... such that E_6, 1 - 504*q - 16632*q^2 - ... (A013973) is equal to (1-q)^a(1) (1-q^2)^a(2) (1-q^3)^a(3) ... .at n=3A288851