G.f. A(x) satisfies: A(x) = x + x^2 * exp( Sum_{k>=1} A(x^k)^2 / k ).

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =2a(5) =2a(6) =4a(7) =11a(8) =14a(9) =29a(10) =66a(11) =115a(12) =222a(13) =493a(14) =944a(15) =1884a(16) =4020a(17) =8175a(18) =16618a(19) =35198a(20) =73220a(21) =151844a(22) =321036a(23) =676778a(24) =1421828a(25) =3016813a(26) =6407344a(27) =13589888a(28) =28962702a(29) =61853827