Expansion of 1/((1-x)^2*(1-x^2)*(1-x^5)*(1-x^10)*(1-x^20)).

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =9a(5) =13a(6) =18a(7) =24a(8) =31a(9) =39a(10) =50a(11) =62a(12) =77a(13) =93a(14) =112a(15) =134a(16) =159a(17) =187a(18) =218a(19) =252a(20) =293a(21) =337a(22) =388a(23) =442a(24) =503a(25) =571a(26) =646a(27) =728a(28) =817a(29) =913