Expansion of (eta(q^4) * eta(q^5) / (eta(q) * eta(q^20)))^2 in powers of q.

Terms

a(0) =1a(1) =2a(2) =5a(3) =10a(4) =18a(5) =30a(6) =51a(7) =80a(8) =124a(9) =190a(10) =281a(11) =410a(12) =592a(13) =840a(14) =1178a(15) =1640a(16) =2253a(17) =3070a(18) =4154a(19) =5570a(20) =7422a(21) =9830a(22) =12932a(23) =16920a(24) =22028a(25) =28520a(26) =36761a(27) =47180a(28) =60280a(29) =76720