Expansion of 1/(1-x)^2/(1-x^2)/(1-x^4)/(1-x^10)/(1-x^20).

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =10a(5) =14a(6) =20a(7) =26a(8) =35a(9) =44a(10) =57a(11) =70a(12) =88a(13) =106a(14) =130a(15) =154a(16) =185a(17) =216a(18) =255a(19) =294a(20) =344a(21) =394a(22) =456a(23) =518a(24) =595a(25) =672a(26) =765a(27) =858a(28) =970a(29) =1082