Expansion of Product_{n>=1} (1 - x^(5*n))/(1 - x^n)^5 in powers of x.

Terms

a(0) =1a(1) =5a(2) =20a(3) =65a(4) =190a(5) =505a(6) =1260a(7) =2970a(8) =6700a(9) =14535a(10) =30520a(11) =62235a(12) =123720a(13) =240340a(14) =457380a(15) =854190a(16) =1568230a(17) =2834120a(18) =5048140a(19) =8871450a(20) =15396690a(21) =26410860a(22) =44811440a(23) =75254240a(24) =125162100a(25) =206275505a(26) =337032360a(27) =546183425a(28) =878270360a(29) =1401857550