We have a sequence of vectors $\mathbf{u}^{(k)} = (u_1^{(k)}, u_2^{(k)}, \ldots, u_n^{(k)})$ where each component $u_i^{(k)}$ at step $k+1$ is defined as the sum of its two neighboring components at step $k$, i.e., $u_i^{(k+1)} = u_{i-1}^{(k)} + u_{i+1}^{(k)}$.
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