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) =1a(4) =2a(5) =3a(6) =5a(7) =8a(8) =14a(9) =25a(10) =44a(11) =78a(12) =142a(13) =261a(14) =479a(15) =886a(16) =1655a(17) =3105a(18) =5843a(19) =11043a(20) =20965a(21) =39938a(22) =76285a(23) =146123a(24) =280691a(25) =540475a(26) =1042885a(27) =2016481a(28) =3906647a(29) =7582034