Expansion of (1 - x)^(-2) * Sum_{j>=0} (x^j / (1 - Sum_{k=1..j} x^k)).

Terms

a(0) =1a(1) =3a(2) =7a(3) =14a(4) =26a(5) =46a(6) =80a(7) =138a(8) =239a(9) =417a(10) =735a(11) =1309a(12) =2355a(13) =4275a(14) =7823a(15) =14416a(16) =26728a(17) =49820a(18) =93300a(19) =175454a(20) =331170a(21) =627154a(22) =1191204a(23) =2268604a(24) =4330915a(25) =8286101a(26) =15884857a(27) =30507175a(28) =58686513a(29) =113066033