Expansion of (1-q)^k/Product_{j=1..k} (1-q^j) for k=12.

Terms

a(0) =1a(1) =-11a(2) =56a(3) =-175a(4) =376a(5) =-592a(6) =719a(7) =-722a(8) =678a(9) =-696a(10) =815a(11) =-988a(12) =1143a(13) =-1254a(14) =1374a(15) =-1602a(16) =1986a(17) =-2440a(18) =2794a(19) =-2971a(20) =3095a(21) =-3378a(22) =3906a(23) =-4562a(24) =5147a(25) =-5568a(26) =5937a(27) =-6487a(28) =7336a(29) =-8317