Expansion of (1/(1 - x))*Product_{k>=1} (1 + k*x^k).

Terms

a(0) =1a(1) =2a(2) =4a(3) =9a(4) =16a(5) =31a(6) =56a(7) =99a(8) =163a(9) =283a(10) =469a(11) =757a(12) =1220a(13) =1915a(14) =3020a(15) =4748a(16) =7273a(17) =11014a(18) =16789a(19) =25033a(20) =37480a(21) =55782a(22) =82206a(23) =120033a(24) =174762a(25) =253092a(26) =364276a(27) =523814a(28) =749438a(29) =1064853