G.f. A(x) satisfies: A(x) = A(x^2 - x^4)/x.

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =3a(4) =-4a(5) =6a(6) =-7a(7) =-11a(8) =54a(9) =-68a(10) =-33a(11) =207a(12) =-160a(13) =-398a(14) =1087a(15) =-461a(16) =-3370a(17) =11120a(18) =-18761a(19) =9287a(20) =52861a(21) =-191783a(22) =325226a(23) =-164758a(24) =-710654a(25) =2437586a(26) =-4100514a(27) =2865198a(28) =6070531a(29) =-26403315