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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =1a(4) =-1a(5) =1a(6) =23a(7) =-83a(8) =203a(9) =-413a(10) =749a(11) =10843a(12) =-70603a(13) =271573a(14) =-816733a(15) =2102017a(16) =21579095a(17) =-214325285a(18) =1126810565a(19) =-4459081205a(20) =14750556437a(21) =110710301893