Expansion of (eta(q) * eta(q^39)) / (eta(q^3) * eta(q^13)) in powers of q.

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =1a(4) =-1a(5) =0a(6) =2a(7) =-1a(8) =-1a(9) =3a(10) =-2a(11) =-1a(12) =4a(13) =-2a(14) =-3a(15) =4a(16) =-3a(17) =-3a(18) =8a(19) =-4a(20) =-5a(21) =9a(22) =-4a(23) =-6a(24) =13a(25) =-6a(26) =-7a(27) =14a(28) =-10a(29) =-9