Suppose such sequences $(a_{n})$ and $(b_{n})$ exist. For each pair $(x, y)$ of real numbers we consider the corresponding point $(x, y)$ in the coordinate plane. Let $P_{n}$ for each $n$ denote the point $(a_{n}, b_{n})$. The condition in the problem requires that the square $\{(x, y): |x - a_{n}| \leq \frac{1}{\sqrt{n}}, |y - b_{n}| \leq \frac{1}{\sqrt{n}}\}$ does not contain $P_{m}$ for $m \neq n$. For each point $A_{n}$ we construct its private square $\{(x, y): |x - a_{n}| \leq \frac{1}{2\sqrt{n}}, |y - b_{n}| \leq \frac{1}{2\sqrt{n}}\}$. The condition implies that private squares of points $A_{n}$ and $A_{m}$ are disjoint when $m \neq n$. Let $|a_{n}| < C, |b_{n}| < C$ for all $n$. Then all private squares of points $A_{n}$ lie in the square $\{(x, y): |x| \leq C + \frac{1}{2}, |y| \leq C + \frac{1}{2}\}$ with area $(2C + 1)^{2}$. However private squares do not intersect, and the private square of $P_{n}$ has area $\frac{1}{n}$. The series $1 + \frac{1}{2} + \frac{1}{3} + \cdots$ diverges; in particular, it contains some finite number of terms with sum greater than $(2C + 1)^{2}$, which is impossible if the respective private square lie inside a square with area $(2C + 1)^{2}$ and do not intersect. This contradiction shows that the desired sequences $(a_{n})$ and $(b_{n})$ do not exist.