  In this work, we give upper bounds for $n$ on the title equation. Our results
depend on assertions describing the precise exponents of $2$ and $3$ appearing
in the prime factorization of $T_{k}(x)=(x+1)^{k}+(x+2)^{k}+...+(2x)^{k}$.
Further, on combining Baker's method with the explicit solution of polynomial
exponential congruences (see e.g. BHMP), we show that for $2 \leq x \leq 13, k
\geq 1, y \geq 2$ and $n \geq 3$ the title equation has no solutions.
