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

Terms

a(0) =1a(1) =1a(2) =0a(3) =-2a(4) =-1a(5) =8a(6) =10a(7) =-37a(8) =-84a(9) =168a(10) =660a(11) =-624a(12) =-4950a(13) =583a(14) =35464a(15) =23166a(16) =-240513a(17) =-359008a(18) =1511640a(19) =3898100a(20) =-8387664a(21) =-36522256a(22) =35444728a(23) =311764768a(24) =-25659766a(25) =-2466384737a(26) =-1793133360a(27) =18077558170a(28) =28951038285a(29) =-120750295320