Expansion of Product_{k>=1} (1 - x^k)^9.

Terms

a(0) =1a(1) =-9a(2) =27a(3) =-12a(4) =-90a(5) =135a(6) =54a(7) =-99a(8) =-189a(9) =-85a(10) =657a(11) =-162a(12) =-135a(13) =-171a(14) =-810a(15) =702a(16) =495a(17) =837a(18) =-673a(19) =-900a(20) =243a(21) =-1053a(22) =-297a(23) =1566a(24) =2700a(25) =-1764a(26) =81a(27) =-1188a(28) =-1377a(29) =270