Expansion of Product_{k>=1} (1 - x^k)^(k*(k+1)*(2*k+1)/6).

Terms

a(0) =1a(1) =-1a(2) =-5a(3) =-9a(4) =-6a(5) =35a(6) =125a(7) =275a(8) =291a(9) =-241a(10) =-2111a(11) =-5989a(12) =-10990a(13) =-11660a(14) =6454a(15) =68298a(16) =201859a(17) =400794a(18) =546122a(19) =269907a(20) =-1175825a(21) =-4890783a(22) =-11746437a(23) =-20668698a(24) =-25146121a(25) =-7959643a(26) =63707489a(27) =236244458a(28) =546634684a(29) =956731805