Expansion of Product_{m>=1} (1+q^m)^(-21).

Terms

a(0) =1a(1) =-21a(2) =210a(3) =-1351a(4) =6426a(5) =-24780a(6) =82845a(7) =-250806a(8) =703731a(9) =-1853481a(10) =4628337a(11) =-11052867a(12) =25403952a(13) =-56451192a(14) =121738767a(15) =-255623851a(16) =524037507a(17) =-1051143723a(18) =2066899387a(19) =-3990768663a(20) =7577013360a(21) =-14163858895