Expansion of Product_{k>=1} (1 - x^(7*k))^8/(1 - x^k)^9 in powers of x.

Terms

a(0) =1a(1) =9a(2) =54a(3) =255a(4) =1035a(5) =3753a(6) =12483a(7) =38701a(8) =113193a(9) =315013a(10) =839802a(11) =2155905a(12) =5352252a(13) =12894426a(14) =30233558a(15) =69160869a(16) =154677325a(17) =338822547a(18) =728084435a(19) =1536931932a(20) =3190959918a(21) =6523084815a(22) =13142291319a(23) =26118847655a(24) =51244059231a(25) =99322878506a(26) =190306301025