Expansion of Product_{k>=1} (1-x^k)^28.

Terms

a(0) =1a(1) =-28a(2) =350a(3) =-2520a(4) =11025a(5) =-26180a(6) =4158a(7) =184600a(8) =-554400a(9) =401100a(10) =1496964a(11) =-3920280a(12) =1444625a(13) =6224400a(14) =-4972350a(15) =-7121296a(16) =-8308965a(17) =50796900a(18) =-8971200a(19) =-121968000a(20) =94011435a(21) =80598288a(22) =20282500a(23) =-175228200