$y(x)=a_0+a_{1}x+\frac{1}{6}{a}_0{x}^2+\frac{1}{27}{a}_0{x}^3+\frac{5}{684}{a}_0{x}^4+$cdots

$y(x)=(1+\frac{1}{6}{x}^2+\frac{1}{27}{x}^3+\frac{5}{68u}{x}^4+$cdots$)a_0+x{a}_1$

GIVE ME GINIRAL FORM FOR SEREIS