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

Terms

a(0) =1a(1) =1a(2) =-2a(3) =1a(4) =6a(5) =-18a(6) =8a(7) =89a(8) =-266a(9) =62a(10) =1684a(11) =-4710a(12) =-220a(13) =35648a(14) =-91236a(15) =-34871a(16) =803302a(17) =-1856874a(18) =-1448844a(19) =18809694a(20) =-38816620a(21) =-48910700a(22) =451491680a(23) =-820626294a(24) =-1522994404a(25) =11015923292a(26) =-17319046712a(27) =-45512957516a(28) =271664145264a(29) =-359911736252