G.f. A(x) satisfies A(x) = 1 - x/A(x) * (1 - A(x) - A(x)^2).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =3a(5) =1a(6) =-2a(7) =-1a(8) =10a(9) =25a(10) =12a(11) =-65a(12) =-151a(13) =-7a(14) =588a(15) =1083a(16) =-437a(17) =-5247a(18) =-7732a(19) =7943a(20) =47503a(21) =53793a(22) =-105312a(23) =-430117a(24) =-343042a(25) =1249801a(26) =3866558a(27) =1730019a(28) =-13996095a(29) =-34243895