By solving: $$t^2 \left(\frac{d^2R}{dt^2}\right)+2t \left(\frac{dR}{dt}\right)+(t^2-n)R=0$$
Using the method of Frobenius: $$R(t)=\sum_{k=0}^\infty a_kt^{k+m}$$
Gives the indicial equation: $$m^2+m-n=0$$
How can the roots of this indicial equation be used to find the Bessel function solutions to this Bessel equation?