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

Terms

a(0) =1a(1) =-1a(2) =-3a(3) =-1a(4) =0a(5) =10a(6) =8a(7) =12a(8) =1a(9) =-28a(10) =-29a(11) =-67a(12) =-51a(13) =-28a(14) =79a(15) =163a(16) =256a(17) =343a(18) =273a(19) =136a(20) =-351a(21) =-649a(22) =-1446a(23) =-1751a(24) =-1889a(25) =-1453a(26) =-124a(27) =1924a(28) =5138a(29) =7608