G.f. satisfies A(x) = 1 + x/A(x)*(1 + 1/A(x)).

Terms

a(0) =1a(1) =2a(2) =-6a(3) =34a(4) =-238a(5) =1858a(6) =-15510a(7) =135490a(8) =-1223134a(9) =11320066a(10) =-106830502a(11) =1024144482a(12) =-9945711566a(13) =97634828354a(14) =-967298498358