Expansion of Product_{k>=1} (1 - x^k)^(k*(k+1)/2).

Terms

a(0) =1a(1) =-1a(2) =-3a(3) =-3a(4) =-1a(5) =10a(6) =20a(7) =36a(8) =28a(9) =-11a(10) =-103a(11) =-245a(12) =-397a(13) =-448a(14) =-214a(15) =464a(16) =1817a(17) =3680a(18) =5660a(19) =6473a(20) =4362a(21) =-3232a(22) =-18428a(23) =-41946a(24) =-70589a(25) =-94890a(26) =-96996a(27) =-49673a(28) =78907a(29) =317995