The initial value problem
$$\begin{array}{l}
\dfrac{d u}{d t}=u^{2}+t^{2}, \quad t \geq 0 \\
\text { with } u(0)=1
\end{array}$$
is solved by using the explicit Euler method with step size $h=0.2$. Then, the value of $u(0.4)$ (rounded off upto two decimal places) is $\_\_\_\_$
