Expansion of Product_{m>=1} (1+q^m)^(-20).

Terms

a(0) =1a(1) =-20a(2) =190a(3) =-1160a(4) =5245a(5) =-19324a(6) =62150a(7) =-182040a(8) =495750a(9) =-1269620a(10) =3088376a(11) =-7197240a(12) =16164595a(13) =-35136760a(14) =74192590a(15) =-152674048a(16) =306968470a(17) =-604298520a(18) =1166898210a(19) =-2213813640a(20) =4132159452a(21) =-7597272900