B(1) = 1, B(t) = t + 1, B(t^2) = t^2 + 2 t + 1 \Rightarrow B(e,e) = \left[ \begin{matrix} 1 & 1 & 1 \\ 0 & 1 & 2 \\ 0 & 0 & 1 \end{matrix} \right]