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

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =-1a(5) =-4a(6) =-8a(7) =-10a(8) =2a(9) =40a(10) =115a(11) =174a(12) =22a(13) =-736a(14) =-2495a(15) =-4276a(16) =-920a(17) =20593a(18) =75011a(19) =135814a(20) =17524a(21) =-788871a(22) =-2909061a(23) =-5248648a(24) =623274a(25) =38581252a(26) =138036877a(27) =235567666a(28) =-134440249a(29) =-2284840691