E.g.f. satisfies y'' + y' - x^3*y = 0 with y(0)=1, y'(0)=0.

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =6a(6) =-6a(7) =6a(8) =-6a(9) =6a(10) =2010a(11) =-5034a(12) =9354a(13) =-15294a(14) =23214a(15) =3425946a(16) =-14420202a(17) =39956622a(18) =-91344462a(19) =186057582a(20) =16587374034a(21) =-100426428462a(22) =373729722942