Expansion of (1-q)^k/Product_{j=1..k} (1-q^j) for k=16.

Terms

a(0) =1a(1) =-15a(2) =106a(3) =-469a(4) =1457a(5) =-3381a(6) =6099a(7) =-8829a(8) =10624a(9) =-11208a(10) =11274a(11) =-11858a(12) =13447a(13) =-15709a(14) =18001a(15) =-20090a(16) =22420a(17) =-25667a(18) =29965a(19) =-34627a(20) =38835a(21) =-42687a(22) =47352a(23) =-53944a(24) =62270a(25) =-70875a(26) =78399a(27) =-84913a(28) =91988a(29) =-101370