Expansion of Product_{k>=1} (1 - x^(7*k))^12/(1 - x^k)^13 in powers of x.

Terms

a(0) =1a(1) =13a(2) =104a(3) =637a(4) =3276a(5) =14820a(6) =60697a(7) =229360a(8) =810498a(9) =2705118a(10) =8592857a(11) =26134654a(12) =76476816a(13) =216174700a(14) =592220696a(15) =1576826355a(16) =4090222409a(17) =10357895639a(18) =25653139694a(19) =62235901689a(20) =148108568986a(21) =346176981673a(22) =795569268689