Expansion of eta(q) * eta(q^9) * eta(q^21)^2 / (eta(q^3)^2 * eta(q^7) * eta(q^63)) in powers of q.

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =2a(4) =-2a(5) =-1a(6) =5a(7) =-3a(8) =-4a(9) =8a(10) =-5a(11) =-6a(12) =16a(13) =-8a(14) =-11a(15) =23a(16) =-15a(17) =-16a(18) =39a(19) =-21a(20) =-26a(21) =58a(22) =-35a(23) =-39a(24) =92a(25) =-51a(26) =-58a(27) =132a(28) =-77a(29) =-85