G.f. satisfies A(x) = 1 + x/(1 + x^4)^2 * A(x/(1 + x^4)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =-1a(6) =-4a(7) =-8a(8) =-13a(9) =-16a(10) =-3a(11) =39a(12) =126a(13) =273a(14) =411a(15) =283a(16) =-619a(17) =-3149a(18) =-8201a(19) =-14496a(20) =-14368a(21) =12984a(22) =109920a(23) =329552a(24) =655436a(25) =785583a(26) =-312525a(27) =-5009034a(28) =-16789151a(29) =-36433571