G.f. A(x) satisfies: A(x) = x + x^2 * exp(A(x) - A(-x^2)/2 + A(x^3)/3 - A(-x^4)/4 + ...).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =5a(6) =9a(7) =17a(8) =31a(9) =58a(10) =112a(11) =218a(12) =427a(13) =844a(14) =1683a(15) =3381a(16) =6824a(17) =13842a(18) =28226a(19) =57796a(20) =118762a(21) =244874a(22) =506515a(23) =1050688a(24) =2185095a(25) =4555217a(26) =9517423a(27) =19926174a(28) =41798031a(29) =87833877