G.f. satisfies A(x) = 1 / (1 + x*(1 + x*A(x))^4).

Terms

a(0) =1a(1) =-1a(2) =-3a(3) =5a(4) =29a(5) =-42a(6) =-349a(7) =384a(8) =4705a(9) =-3307a(10) =-67530a(11) =19392a(12) =1006479a(13) =140594a(14) =-15356600a(15) =-8897336a(16) =237691865a(17) =246737931a(18) =-3708348277a(19) =-5655844305a(20) =58027927950a(21) =119178376245a(22) =-906834380800