Absolute stability region
Stable region in red.

Coefficients

\begin{align} y_{n + 3} - \frac{18}{11} y_{n + 2} + \frac{9}{11} y_{n + 1} - \frac{2}{11} y_{n} = \frac{6}{11}h f(y_{n + 3})\end{align}

Properties