Runge-Kutta method - Rosetta Code
y(0) = 1 ± 0e+0 y(1) = 1.562499854278108 ± 1.4572189210859676e-7 y(2) = 3.999999080520799 ± 9.194792007782837e-7 y(3) = 10.562497090437551 ± 2.9095624487496252e-6 y(4) = 24.999993765090636 ± 6.234909363911356e-6 y(5) = 52 ......