Expansion of Product_{m>=1} (1+m*q^m)^-13.

Terms

a(0) =1a(1) =-13a(2) =65a(3) =-156a(4) =273a(5) =-1014a(6) =3497a(7) =-6539a(8) =12116a(9) =-39819a(10) =99086a(11) =-178009a(12) =395044a(13) =-988651a(14) =2103335a(15) =-4237363a(16) =8806967a(17) =-19098131a(18) =40962220a(19) =-80207062a(20) =158661230a(21) =-337459980a(22) =681006807a(23) =-1307462312a(24) =2595164702