\begin{array}{cc}
d^{(2)}_0 = 0 & \\
d^{(2)}_1 = 2 & n^{(2)}_1=1 \\
d^{(2)}_2 = 3 & n^{(2)}_2=1 \\
d^{(2)}_3 = 3 & n^{(2)}_3=0 \\
\cdots & \cdots
\end{array}