Expansion of Product_{k>=1} (1 - x^k)^15.

Terms

a(0) =1a(1) =-15a(2) =90a(3) =-245a(4) =105a(5) =1107a(6) =-2485a(7) =195a(8) =4860a(9) =-2420a(10) =-3990a(11) =-8190a(12) =19695a(13) =13755a(14) =-38475a(15) =3990a(16) =-9750a(17) =34020a(18) =43015a(19) =-46605a(20) =-13860a(21) =-127385a(22) =106485a(23) =165240a(24) =-79275a(25) =-16380a(26) =-92340a(27) =-35840a(28) =-151995a(29) =188550