G.f. satisfies A(x) = 1 + x*A(x) - x^2*A(x)^3.

Terms

a(0) =1a(1) =1a(2) =0a(3) =-3a(4) =-6a(5) =2a(6) =38a(7) =77a(8) =-58a(9) =-658a(10) =-1240a(11) =1562a(12) =13064a(13) =22076a(14) =-41710a(15) =-279427a(16) =-411418a(17) =1114998a(18) =6252048a(19) =7758726a(20) =-29876900a(21) =-143956676a(22) =-143561972a(23) =802102322a(24) =3376515404a(25) =2496314012a(26) =-21558225312a(27) =-80113377828a(28) =-37101814188a(29) =579611761168